Susskind is widely regarded as one of the fathers of string theory, having, with Yoichiro Nambu and Holger Bech Nielsen, independently introduced the idea that particles could in fact be states of excitation of a relativistic string. He was the first to give a precise string-theory interpretation of the holographic principle in 1995 and the first to introduce the idea of the string theory landscape in 2003.

Susskind was awarded the 1998 J. J. Sakurai Prize.

Leonard Susskind was born to a Jewish family from the South Bronx section of New York City, he now resides in Palo Alto, California. He began working as a plumber at the age of 16, taking over from his father who had become ill. Later, he enrolled in the City College of New York as an engineering student, graduating with a B.S. in physics in 1962. In an interview in the *Los Angeles Times*, Susskind recalls the moment he discussed with his father this change in career path: "When I told my father I wanted to be a physicist, he said: ‘Hell no, you ain’t going to work in a drug store.’ I said, "No. Not a pharmacist." I said, ‘Like Einstein.’ He poked me in the chest with a piece of plumbing pipe. ‘You ain’t going to be no engineer’, he said. ‘You’re going to be Einstein.’" Susskind then studied at Cornell University under Peter A. Carruthers where he earned his Ph.D. in 1965. He has been married twice, first in 1960, and has four children.

Susskind was an assistant professor of physics, then an associate professor at Yeshiva University (1966–1970), after which he went for a year to the Tel Aviv University (1971–72), returning to Yeshiva to become a professor of physics (1970–1979). Since 1979 he has been professor of physics at Stanford University, and since 2000 has held the Felix Bloch professorship of physics.

Susskind was awarded the 1998 J. J. Sakurai Prize for his "pioneering contributions to hadronic string models, lattice gauge theories, quantum chromodynamics, and dynamical symmetry breaking". Susskind's hallmark, according to colleagues, has been the application of "brilliant imagination and originality to the theoretical study of the nature of the elementary particles and forces that make up the physical world".

In 2007, Susskind joined the faculty of Perimeter Institute for Theoretical Physics in Waterloo, Ontario, Canada, as an associate member. He has been elected to the National Academy of Sciences and the American Academy of Arts and Sciences. He is also a distinguished professor at Korea Institute for Advanced Study.

Susskind was one of at least three physicists, alongside Yoichiro Nambu and Holger Bech Nielsen, who independently discovered during or around 1970 that the Veneziano dual resonance model of strong interactions could be described by a quantum mechanical model of oscillating strings, and was the first to propose the idea of the string theory landscape. Susskind has also made contributions in the following areas of physics:

The independent discovery of the string theory model of particle physics
The theory of quark confinement
The development of Hamiltonian lattice gauge theory known as Kogut-Susskind fermions
The theory of scaling violations in deep inelastic electroproduction
The theory of symmetry breaking sometimes known as "technicolor theory"
The second, yet independent, theory of cosmological baryogenesis (Andrei Sakharov's work was first, but was mostly unknown in the Western hemisphere)
String theory of black hole entropy
The principle of black hole complementarity
The causal patch hypothesis
The holographic principle
M-theory, including development of the BFSS matrix model
Introduction of holographic entropy bounds in physical cosmology
The idea of an anthropic string theory landscape
The Census Taker's Hat
Susskind is the author of several popular science books.

*The Cosmic Landscape: String Theory and the Illusion of Intelligent Design* is Susskind's first popular science book, published by Little, Brown and Company on December 12, 2005. It is Susskind's attempt to bring his idea of the anthropic landscape of string theory to the general public. In the book, Susskind describes how the string theory landscape was an almost inevitable consequence of several factors, one of which was Steven Weinberg's prediction of the cosmological constant in 1987. The question addressed here is why our universe is fine-tuned for our existence. Susskind explains that Weinberg calculated that if the cosmological constant was just a little different, our universe would cease to exist.

*The Black Hole War: My Battle with Stephen Hawking to Make the World Safe for Quantum Mechanics* is Susskind's second popular science book, published by Little, Brown, and Company on July 7, 2008. The book is his most famous work and explains what he thinks would happen to the information and matter stored in a black hole when it evaporates. The book sparked from a debate that started in 1981, when there was a meeting of physicists to try to decode some of the mysteries about how particles of particular elemental compounds function. During this discussion Stephen Hawking stated that the information inside a black hole is lost forever as the black hole evaporates. It took 28 years for Leonard Susskind to formulate his theory that would prove Hawking wrong. He then published his theory in his book, The Black Hole War. Like *The Cosmic Landscape*, *The Black Hole War* is aimed at the lay reader. He writes: "The real tools for understanding the quantum universe are abstract mathematics: infinite dimensional Hilbert spaces, projection operators, unitary matrices and a lot of other advanced principles that take a few years to learn. But let's see how we do in just a few pages."

Susskind is currently co-authoring a series of companion books to his lecture series *The Theoretical Minimum*. The first of these, *The Theoretical Minimum: What You Need to Know to Start Doing Physics*, was published in 2013 and presents the modern formulations of classical mechanics. The second of these, *Quantum Mechanics: The Theoretical Minimum*, was published in February 2014. The next book is expected to be largely concerned with special relativity.

Susskind teaches a series of Stanford Continuing Studies courses about modern physics referred to as *The Theoretical Minimum*. The title of the series is a clear reference to the Landau's famous comprehensive exam called the "Theoretical Minimum" which students were expected to pass before admission to his school. *The Theoretical Minimum* lectures later formed the basis for the books of the same name. The goal of the courses is to teach the basic but rigorous theoretical foundations required to study certain areas of physics. The sequence covers classical mechanics, relativity, quantum mechanics, statistical mechanics, and cosmology, including the physics of black holes.

These courses are available on *The Theoretical Minimum* website, on iTunes, and on YouTube. The courses are intended for the mathematically literate public as well as physical science/mathematics students. Susskind aims the courses at people with prior exposure to algebra, calculus, vectors, differential calculus, integrals, and perhaps differential operators, matrices, and linear equations. Homework and study outside of class is otherwise unnecessary. Susskind explains most of the mathematics used, which form the basis of the lectures.

It was calculated on the basis of internet contacts that these lectures were visualized more than 4,000,000 times and that different parts of the series were attended by about 40,000 people. This makes Leonard Susskind the most influential professor of physics in the history of the world.

Susskind gave 3 lectures "The Birth of the Universe and the Origin of Laws of Physics" April 28-May 1, 2014 in the Cornell Messenger Lecture series which are posted on a Cornell website.

The Smolin-Susskind debate refers to the series of intense postings in 2004 between Lee Smolin and Susskind, concerning Smolin’s argument that the "anthropic principle cannot yield any falsifiable predictions, and therefore cannot be a part of science." It began on July 26, 2004, with Smolin's publication of "Scientific alternatives to the anthropic principle". Smolin e-mailed Susskind asking for a comment. Having not had the chance to read the paper, Susskind requested a summarization of his arguments. Smolin obliged, and on July 28, 2004, Susskind responded, saying that the logic Smolin followed "can lead to ridiculous conclusions". The next day, Smolin responded, saying that "If a large body of our colleagues feels comfortable believing a theory that cannot be proved wrong, then the progress of science could get stuck, leading to a situation in which false, but unfalsifiable theories dominate the attention of our field." This was followed by another paper by Susskind which made a few comments about Smolin's theory of "cosmic natural selection". The Smolin-Susskind debate finally ended with each of them agreeing to write a final letter which would be posted on the edge.org website, with three conditions attached: (1) No more than one letter each; (2) Neither sees the other's letter in advance; (3) No changes after the fact.

Susskind was a close friend of Richard Feynman, though they never published a paper together. Susskind always referred to Feynman as "Dick". While at a conference in France, Feynman took to calling Susskind "Leonardo" because he was practicing his French.

Susskind is a great-grandfather.