Leonard Susskind

Early life and education Leonard Susskind was born in the South Bronx in New York City to a poor Jewish family whose father was a plumber. He began working as a plumber himself at the age of 16, taking over from his father who had become ill.

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.

Scientific career Susskind was one of at least three physicists, alongside Yoichiro Nambu and Holger Bech Nielsen, who independently discovered during or around 1970 that Gabriele Veneziano's 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 important 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 Banks–Fischler–Shenker–Susskind matrix string model Introduction of holographic entropy bounds in physical cosmology Cool horizons for entangled black holes The idea of an anthropic string theory landscape 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

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".

The Theoretical Minimum book series

Susskind co-authored 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 third book, Special Relativity and Classical Field Theory: The Theoretical Minimum (September 26, 2017), introduces readers to Einstein's special relativity and Maxwell's classical field theory. The fourth book in the series, General Relativity: The Theoretical Minimum was published in January 2023.

The Theoretical Minimum lecture series 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 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, and calculus. Homework and study outside of class is otherwise unnecessary. Susskind explains most of the mathematics used, which form the basis of the lectures.

Cornell Messenger Lectures 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.

Smolin–Susskind debate 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 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.

Personal life He has been married twice, first in 1960, and has four children.