The mathematician who cracked Wall Street | Jim Simons

The mathematician who cracked Wall Street | Jim Simons


Chris Anderson: You were something
of a mathematical phenom.
You had already taught at Harvard
and MIT at a young age.
And then the NSA came calling.
What was that about?
Jim Simons: Well the NSA —
that’s the National Security Agency —
they didn’t exactly come calling.
They had an operation at Princeton,
where they hired mathematicians
to attack secret codes
and stuff like that.
And I knew that existed.
And they had a very good policy,
because you could do half your time
at your own mathematics,
and at least half your time
working on their stuff.
And they paid a lot.
So that was an irresistible pull.
So, I went there.
CA: You were a code-cracker.
JS: I was.
CA: Until you got fired.
JS: Well, I did get fired. Yes.
CA: How come?
JS: Well, how come?
I got fired because,
well, the Vietnam War was on,
and the boss of bosses in my organization
was a big fan of the war
and wrote a New York Times article,
a magazine section cover story,
about how we would win in Vietnam.
And I didn’t like that war,
I thought it was stupid.
And I wrote a letter to the Times,
which they published,
saying not everyone
who works for Maxwell Taylor,
if anyone remembers that name,
agrees with his views.
And I gave my own views …
CA: Oh, OK. I can see that would —
JS: … which were different
from General Taylor’s.
But in the end, nobody said anything.
But then, I was 29 years old at this time,
and some kid came around
and said he was a stringer
from Newsweek magazine
and he wanted to interview me
and ask what I was doing about my views.
And I told him, “I’m doing
mostly mathematics now,
and when the war is over,
then I’ll do mostly their stuff.”
Then I did the only
intelligent thing I’d done that day —
I told my local boss
that I gave that interview.
And he said, “What’d you say?”
And I told him what I said.
And then he said,
“I’ve got to call Taylor.”
He called Taylor; that took 10 minutes.
I was fired five minutes after that.
CA: OK.
JS: But it wasn’t bad.
CA: It wasn’t bad,
because you went on to Stony Brook
and stepped up your mathematical career.
You started working with this man here.
Who is this?
JS: Oh, [Shiing-Shen] Chern.
Chern was one of the great
mathematicians of the century.
I had known him when
I was a graduate student at Berkeley.
And I had some ideas,
and I brought them to him
and he liked them.
Together, we did this work
which you can easily see up there.
There it is.
CA: It led to you publishing
a famous paper together.
Can you explain at all what that work was?
JS: No.
(Laughter)
JS: I mean, I could
explain it to somebody.
(Laughter)
CA: How about explaining this?
JS: But not many. Not many people.
CA: I think you told me
it had something to do with spheres,
so let’s start here.
JS: Well, it did,
but I’ll say about that work —
it did have something to do with that,
but before we get to that —
that work was good mathematics.
I was very happy with it; so was Chern.
It even started a little sub-field
that’s now flourishing.
But, more interestingly,
it happened to apply to physics,
something we knew nothing about —
at least I knew nothing about physics,
and I don’t think Chern
knew a heck of a lot.
And about 10 years
after the paper came out,
a guy named Ed Witten in Princeton
started applying it to string theory
and people in Russia started applying it
to what’s called “condensed matter.”
Today, those things in there
called Chern-Simons invariants
have spread through a lot of physics.
And it was amazing.
We didn’t know any physics.
It never occurred to me
that it would be applied to physics.
But that’s the thing about mathematics —
you never know where it’s going to go.
CA: This is so incredible.
So, we’ve been talking about
how evolution shapes human minds
that may or may not perceive the truth.
Somehow, you come up
with a mathematical theory,
not knowing any physics,
discover two decades later
that it’s being applied
to profoundly describe
the actual physical world.
How can that happen?
JS: God knows.
(Laughter)
But there’s a famous physicist
named [Eugene] Wigner,
and he wrote an essay on the unreasonable
effectiveness of mathematics.
Somehow, this mathematics,
which is rooted in the real world
in some sense — we learn to count,
measure, everyone would do that —
and then it flourishes on its own.
But so often it comes
back to save the day.
General relativity is an example.
[Hermann] Minkowski had this geometry,
and Einstein realized,
“Hey! It’s the very thing
in which I can cast general relativity.”
So, you never know. It is a mystery.
It is a mystery.
CA: So, here’s a mathematical
piece of ingenuity.
Tell us about this.
JS: Well, that’s a ball — it’s a sphere,
and it has a lattice around it —
you know, those squares.
What I’m going to show here was
originally observed by [Leonhard] Euler,
the great mathematician, in the 1700s.
And it gradually grew to be
a very important field in mathematics:
algebraic topology, geometry.
That paper up there had its roots in this.
So, here’s this thing:
it has eight vertices,
12 edges, six faces.
And if you look at the difference —
vertices minus edges plus faces —
you get two.
OK, well, two. That’s a good number.
Here’s a different way of doing it —
these are triangles covering —
this has 12 vertices and 30 edges
and 20 faces, 20 tiles.
And vertices minus edges
plus faces still equals two.
And in fact, you could do this
any which way —
cover this thing with all kinds
of polygons and triangles
and mix them up.
And you take vertices minus edges
plus faces — you’ll get two.
Here’s a different shape.
This is a torus, or the surface
of a doughnut: 16 vertices
covered by these rectangles,
32 edges, 16 faces.
Vertices minus edges comes out to be zero.
It’ll always come out to zero.
Every time you cover a torus
with squares or triangles
or anything like that,
you’re going to get zero.
So, this is called
the Euler characteristic.
And it’s what’s called
a topological invariant.
It’s pretty amazing.
No matter how you do it,
you’re always get the same answer.
So that was the first sort of thrust,
from the mid-1700s,
into a subject which is now called
algebraic topology.
CA: And your own work
took an idea like this and moved it
into higher-dimensional theory,
higher-dimensional objects,
and found new invariances?
JS: Yes. Well, there were already
higher-dimensional invariants:
Pontryagin classes —
actually, there were Chern classes.
There were a bunch
of these types of invariants.
I was struggling to work on one of them
and model it sort of combinatorially,
instead of the way it was typically done,
and that led to this work
and we uncovered some new things.
But if it wasn’t for Mr. Euler —
who wrote almost 70 volumes of mathematics
and had 13 children,
who he apparently would dandle on his knee
while he was writing —
if it wasn’t for Mr. Euler, there wouldn’t
perhaps be these invariants.
CA: OK, so that’s at least given us
a flavor of that amazing mind in there.
Let’s talk about Renaissance.
Because you took that amazing mind
and having been a code-cracker at the NSA,
you started to become a code-cracker
in the financial industry.
I think you probably didn’t buy
efficient market theory.
Somehow you found a way of creating
astonishing returns over two decades.
The way it’s been explained to me,
what’s remarkable about what you did
wasn’t just the size of the returns,
it’s that you took them
with surprisingly low volatility and risk,
compared with other hedge funds.
So how on earth did you do this, Jim?
JS: I did it by assembling
a wonderful group of people.
When I started doing trading, I had
gotten a little tired of mathematics.
I was in my late 30s,
I had a little money.
I started trading and it went very well.
I made quite a lot of money
with pure luck.
I mean, I think it was pure luck.
It certainly wasn’t mathematical modeling.
But in looking at the data,
after a while I realized:
it looks like there’s some structure here.
And I hired a few mathematicians,
and we started making some models —
just the kind of thing we did back
at IDA [Institute for Defense Analyses].
You design an algorithm,
you test it out on a computer.
Does it work? Doesn’t it work? And so on.
CA: Can we take a look at this?
Because here’s a typical graph
of some commodity.
I look at that, and I say,
“That’s just a random, up-and-down walk —
maybe a slight upward trend
over that whole period of time.”
How on earth could you trade
looking at that,
and see something that wasn’t just random?
JS: In the old days — this is
kind of a graph from the old days,
commodities or currencies
had a tendency to trend.
Not necessarily the very light trend
you see here, but trending in periods.
And if you decided, OK,
I’m going to predict today,
by the average move in the past 20 days —
maybe that would be a good prediction,
and I’d make some money.
And in fact, years ago,
such a system would work —
not beautifully, but it would work.
You’d make money, you’d lose
money, you’d make money.
But this is a year’s worth of days,
and you’d make a little money
during that period.
It’s a very vestigial system.
CA: So you would test
a bunch of lengths of trends in time
and see whether, for example,
a 10-day trend or a 15-day trend
was predictive of what happened next.
JS: Sure, you would try all those things
and see what worked best.
Trend-following would
have been great in the ’60s,
and it was sort of OK in the ’70s.
By the ’80s, it wasn’t.
CA: Because everyone could see that.
So, how did you stay ahead of the pack?
JS: We stayed ahead of the pack
by finding other approaches —
shorter-term approaches to some extent.
The real thing was to gather
a tremendous amount of data —
and we had to get it by hand
in the early days.
We went down to the Federal Reserve
and copied interest rate histories
and stuff like that,
because it didn’t exist on computers.
We got a lot of data.
And very smart people — that was the key.
I didn’t really know how to hire
people to do fundamental trading.
I had hired a few — some made money,
some didn’t make money.
I couldn’t make a business out of that.
But I did know how to hire scientists,
because I have some taste
in that department.
So, that’s what we did.
And gradually these models
got better and better,
and better and better.
CA: You’re credited with doing
something remarkable at Renaissance,
which is building this culture,
this group of people,
who weren’t just hired guns
who could be lured away by money.
Their motivation was doing
exciting mathematics and science.
JS: Well, I’d hoped that might be true.
But some of it was money.
CA: They made a lot of money.
JS: I can’t say that no one came
because of the money.
I think a lot of them
came because of the money.
But they also came
because it would be fun.
CA: What role did machine learning
play in all this?
JS: In a certain sense,
what we did was machine learning.
You look at a lot of data, and you try
to simulate different predictive schemes,
until you get better and better at it.
It doesn’t necessarily feed back on itself
the way we did things.
But it worked.
CA: So these different predictive schemes
can be really quite wild and unexpected.
I mean, you looked at everything, right?
You looked at the weather,
length of dresses, political opinion.
JS: Yes, length of dresses we didn’t try.
CA: What sort of things?
JS: Well, everything.
Everything is grist for the mill —
except hem lengths.
Weather, annual reports,
quarterly reports, historic data itself,
volumes, you name it.
Whatever there is.
We take in terabytes of data a day.
And store it away and massage it
and get it ready for analysis.
You’re looking for anomalies.
You’re looking for — like you said,
the efficient market
hypothesis is not correct.
CA: But any one anomaly
might be just a random thing.
So, is the secret here to just look
at multiple strange anomalies,
and see when they align?
JS: Any one anomaly
might be a random thing;
however, if you have enough data
you can tell that it’s not.
You can see an anomaly that’s persistent
for a sufficiently long time —
the probability of it being
random is not high.
But these things fade after a while;
anomalies can get washed out.
So you have to keep on top
of the business.
CA: A lot of people look
at the hedge fund industry now
and are sort of … shocked by it,
by how much wealth is created there,
and how much talent is going into it.
Do you have any worries
about that industry,
and perhaps the financial
industry in general?
Kind of being on a runaway train that’s —
I don’t know —
helping increase inequality?
How would you champion what’s happening
in the hedge fund industry?
JS: I think in the last
three or four years,
hedge funds have not done especially well.
We’ve done dandy,
but the hedge fund industry as a whole
has not done so wonderfully.
The stock market has been on a roll,
going up as everybody knows,
and price-earnings ratios have grown.
So an awful lot of the wealth
that’s been created in the last —
let’s say, five or six years —
has not been created by hedge funds.
People would ask me,
“What’s a hedge fund?”
And I’d say, “One and 20.”
Which means — now it’s two and 20 —
it’s two percent fixed fee
and 20 percent of profits.
Hedge funds are all
different kinds of creatures.
CA: Rumor has it you charge
slightly higher fees than that.
JS: We charged the highest fees
in the world at one time.
Five and 44, that’s what we charge.
CA: Five and 44.
So five percent flat,
44 percent of upside.
You still made your investors
spectacular amounts of money.
JS: We made good returns, yes.
People got very mad:
“How can you charge such high fees?”
I said, “OK, you can withdraw.”
But “How can I get more?”
was what people were —
(Laughter)
But at a certain point,
as I think I told you,
we bought out all the investors
because there’s a capacity to the fund.
CA: But should we worry
about the hedge fund industry
attracting too much of the world’s
great mathematical and other talent
to work on that, as opposed
to the many other problems in the world?
JS: Well, it’s not just mathematical.
We hire astronomers and physicists
and things like that.
I don’t think we should worry
about it too much.
It’s still a pretty small industry.
And in fact, bringing science
into the investing world
has improved that world.
It’s reduced volatility.
It’s increased liquidity.
Spreads are narrower because
people are trading that kind of stuff.
So I’m not too worried about Einstein
going off and starting a hedge fund.
CA: You’re at a phase in your life now
where you’re actually investing, though,
at the other end of the supply chain —
you’re actually boosting
mathematics across America.
This is your wife, Marilyn.
You’re working on
philanthropic issues together.
Tell me about that.
JS: Well, Marilyn started —
there she is up there,
my beautiful wife —
she started the foundation
about 20 years ago.
I think ’94.
I claim it was ’93, she says it was ’94,
but it was one of those two years.
(Laughter)
We started the foundation,
just as a convenient way to give charity.
She kept the books, and so on.
We did not have a vision at that time,
but gradually a vision emerged —
which was to focus on math and science,
to focus on basic research.
And that’s what we’ve done.
Six years ago or so, I left Renaissance
and went to work at the foundation.
So that’s what we do.
CA: And so Math for America
is basically investing
in math teachers around the country,
giving them some extra income,
giving them support and coaching.
And really trying
to make that more effective
and make that a calling
to which teachers can aspire.
JS: Yeah — instead of beating up
the bad teachers,
which has created morale problems
all through the educational community,
in particular in math and science,
we focus on celebrating the good ones
and giving them status.
Yeah, we give them extra money,
15,000 dollars a year.
We have 800 math and science teachers
in New York City in public schools today,
as part of a core.
There’s a great morale among them.
They’re staying in the field.
Next year, it’ll be 1,000
and that’ll be 10 percent
of the math and science teachers
in New York [City] public schools.
(Applause)
CA: Jim, here’s another project
that you’ve supported philanthropically:
Research into origins of life, I guess.
What are we looking at here?
JS: Well, I’ll save that for a second.
And then I’ll tell you
what you’re looking at.
Origins of life is a fascinating question.
How did we get here?
Well, there are two questions:
One is, what is the route
from geology to biology —
how did we get here?
And the other question is,
what did we start with?
What material, if any,
did we have to work with on this route?
Those are two very,
very interesting questions.
The first question is a tortuous path
from geology up to RNA
or something like that —
how did that all work?
And the other,
what do we have to work with?
Well, more than we think.
So what’s pictured there
is a star in formation.
Now, every year in our Milky Way,
which has 100 billion stars,
about two new stars are created.
Don’t ask me how, but they’re created.
And it takes them about a million
years to settle out.
So, in steady state,
there are about two million stars
in formation at any time.
That one is somewhere
along this settling-down period.
And there’s all this crap
sort of circling around it,
dust and stuff.
And it’ll form probably a solar system,
or whatever it forms.
But here’s the thing —
in this dust that surrounds a forming star
have been found, now,
significant organic molecules.
Molecules not just like methane,
but formaldehyde and cyanide —
things that are the building blocks —
the seeds, if you will — of life.
So, that may be typical.
And it may be typical
that planets around the universe
start off with some of these
basic building blocks.
Now does that mean
there’s going to be life all around?
Maybe.
But it’s a question
of how tortuous this path is
from those frail beginnings,
those seeds, all the way to life.
And most of those seeds
will fall on fallow planets.
CA: So for you, personally,
finding an answer to this question
of where we came from,
of how did this thing happen,
that is something you would love to see.
JS: Would love to see.
And like to know —
if that path is tortuous enough,
and so improbable,
that no matter what you start with,
we could be a singularity.
But on the other hand,
given all this organic dust
that’s floating around,
we could have lots of friends out there.
It’d be great to know.
CA: Jim, a couple of years ago,
I got the chance to speak with Elon Musk,
and I asked him the secret of his success,
and he said taking
physics seriously was it.
Listening to you, what I hear you saying
is taking math seriously,
that has infused your whole life.
It’s made you an absolute fortune,
and now it’s allowing you to invest
in the futures of thousands and thousands
of kids across America and elsewhere.
Could it be that science actually works?
That math actually works?
JS: Well, math certainly works.
Math certainly works.
But this has been fun.
Working with Marilyn and giving it away
has been very enjoyable.
CA: I just find it —
it’s an inspirational thought to me,
that by taking knowledge seriously,
so much more can come from it.
So thank you for your amazing life,
and for coming here to TED.
Thank you.
Jim Simons!
(Applause)

100 thoughts on “The mathematician who cracked Wall Street | Jim Simons”

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  2. Good interview. I don't agree because of Spiritual beliefs on the beginning, but I think this man has a great mind. I did understand what he did with the "wall street" system, and think it makes sense, but then I don't have the team of mathematicians he had. I enjoyed this interview.

  3. An early quant who midwived the birth of absurd derivatives which will continue to crash global finances and steal billions for Medallionaires. A real live evil genius

  4. The way this man looks, talks, his attitude and his response to questions totally reminds me of Greg Popovich both incredible minds 🤔

  5. This talk assumes that markets are NOT computer rigged… this is an old world perspective and not useful today.

    What is TED doing here?

  6. I did not understand one minute of this except that circles are 2 more than donuts and I still have no fvcking idea what the fvck that means. And I watched the entire 20 minutes of this straight. Old people just don't know how to be articulate to millenials, or something, Idk, maybe I'm just not listening LMAO I LEARNED NOTHING.

  7. 6:21 if you find this stuff interesting, it comes from a branch of mathematics (combinatorics to be precise) called Graph Theory. In fact, you'll do the very exact proof of "Euler's formula" (vertices – edges +faces = 2) in that class too 😉

  8. This guy might be a genius when it comes to mathematics but he is retarded when it comes to politics, he donated $10 million to Hillary Clinton

  9. he's in a few other videos

    https://www.youtube.com/watch?v=SVdTF4_QrTM
    https://www.youtube.com/watch?v=gjVDqfUhXOY

  10. Can someone lecture the interviewer. So much interruptions and stupid laughing. If you invite a person to a show, put away your low life ego, and honor the guest.

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  12. 7:10 What's so amazing about that. You've put on imaginary lines which have rules and when you count them a result comes out.

  13. He is a disgrace for a mathematician. He's using pseudo-scientific approach "predicting the future based on the past" for a such complex domain with thousands of unpredictable factors as stock market. Still there are enough idiots buying into it

  14. I wanted to punch that interviewer in the toe. I was completed distracted by his preparation in his body language to interrupt Jim. Jim didnt look particularly entertained by Chris at all. Surprised they let this guy interview on ted

  15. Several hedge funds have been busted for inside information. The fund is one of the biggest contributors to political parties. 6.8 billion tax problem. No details about exactly how the money is being made. Video has no details and is a waste of time.

  16. The interviewer likes to ask so many questions, but when the interviewee starts speaking, he seems to be indifferent. What a heck!

  17. To everyone complaining about him being cut off by the interviewer, please understand there is a time limit to get this vast amount of information out

  18. he's wrong that's based on everyone buying into the market. I had my identity stolen when I was a kid and never made an authentic purchase.

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  20. Maxwell Taylor sounds like exactly the kind of russian or chinese agent who loves authoritarian power abuse and should go dunk himself back to the swamp with trump supporters.

  21. Despise the interviewer who tries to display they’re clever than the interviewees, this guy is one of the worst interviewer I’ve seen.

  22. 9:35 Wow — a startling revelation! Even when he was just starting as a private investor he did not rely on his own analytics. Instead he hired mathematicians right off the bat before he prospered in trading. That is extremely rare, and not the biggest vote of self-confidence. This reminds me of Carroll Shelby; ie, someone who is highly acclaimed for achieving something, but in reality, led a team that achieved greatness.

  23. Isn't it inspiring that mathematicians figured out how to beat the stock market? This is so beneficial to the economy as a whole and really helps millions of small investors. But maybe…the breed of hedge fund billionaires created by this breakthrough..HURTS US ALL!!!

  24. mathematics and statistics can be helpful in algo trading, i wish to learn it but cant help with this.. only trading manually with hotforex to make some bucks sufficient enough for paying my bills.

  25. The interviewer is asking the right questions, Jim's just refusing to give any answers. I got nothing from this.

  26. Didn't learn what I came here to learn. Title is little more than clickbait. All I learned is that he hired some smart people, gathered gargantuan amounts of data, and Poof! Magic! Money started pouring in.

  27. Folks, at 4:26 interviewer credits his religion of how Evolution amazingly shapes the mind …… And seconds later the true credit is unwittingly given when the reply is "God knows".

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  30. Mathematicians can make numbers do whatever they want them to. I am not one of those people that thinks numbers never lie. Math only works if you buy into said laws of mathematics.

  31. that's funny, cos wall st. games aren't based in laws of physics or mathematical realities. they're made up as much as santa claus.

  32. You are all talking about how the interviewer should have let him speak more and not cut him off. But the guy he is interviewing didn’t actually want to directly answer a lot of his questions and gave broad or evasive answers to a lot of questions either bcse he felt the generals public would not understand these complicated mathematical concepts, bcse he didn’t want to give out his trade secrets, or simply bcse he isn’t comfortable talking in front of such a big crowd.

    But the truth is for whatever reason he didn’t really cooperate with what the interviewer was asking and the interviewer truly asked very valid questions that were very well organized in sequence. Very honestly both men are great men in their own fields and the interviewer is one of the best in the whole world and he does an amazing job taking to these remarkable individuals.

    But you have to understand it is his job to get juice out of him and if he’s not really biting he has to bounce of and keep the flow going to make for a very interesting conversation worth being televised otherwise the whole thing would fall flat. We always tend to critique others but some situations simply are as they are. The interviewer did really good considering all the circumstances and is perhaps one of the best interviewers in the entire world otherwise he wouldn’t be assigned by Ted to interview all these remarkable people.

    Objectively speaking I don’t think any average person could come remotely close to his interviewing or public speaking skills.

    The truth is pulling off a televised or an important you tube broadcasted interview in this case comes with natural constraints and sometimes things like this happen either bcse the two people talking naturally don’t have the very best organic chemistry in the world or simply bcse the person interviewed is not comfortable or bcse the audience is not responding properly.

    All in all, considering all the circumstances and factors both the interviewer did very well, he tried to make the guest comfortable without bothering him and to make for a very good interview worth watching regardless of the situation he was dealt.

    We shouldn’t judge and critique others so fast bcse these things are not as easy as they look. And in the entire world very very few people can pull off such interviews on this level.

    The interviewer actually showed true mastery and know how in handling the situation at hand. I really doubt anybody in the comment section could have done better than him if they were actually directly engaging with an old mathematician that is not that comfortable being on stage or answering a lot of the questions.

    Both men are obviously great people but some things simply are as they are.

  33. Amazing. So intelligent but does not even know the place he lives is NOT a planet in a heliocentric solar system, that does not exist in REALITY! SMH.

  34. 17:40 ☼ convenient way to launder money & shield it from taxes. Starts a charity w/o an aim. Some of us here do work in finance you know.

  35. What a desperate bunch here…all looking to get out of the rat race..but let me tell you, with or without money a rat is always a rat.

  36. I remember the first time I encountered the Chern-Simons theory, I was struggling to learn quantum field theory. from what I recall, for string theory, if the Euler characteristic is described by wrapping polygons around the sphere, this describes the modes of vibration for an open string, i.e., V-E+F = 2, so 2 is the number of poles (singularities) connecting the ends of the string. For the torus, 0 poles, so this describes a the modes of vibration of a closed string. I think C-S theory comes in when you're looking for discrete combinations (combinatorial stuff, like Jim mentions) of modes. So instead of looking at all the modes, i.e. a continuum, you get a quantization of the string modes. Speaking strictly form memory and the greatest humility. He is a very inspiring type of guy, it folks like him that encourage the rest of us to learn things are far outside of average.

  37. i don't like this interviewer one bit. he's got this gay sassiness about him like he's waiting for any chance to make sarcastic remarks about you or something…lol

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