Leonard Susskind

Leonard Susskind (born June 16, 1940) is an American theoretical physicist, Professor of theoretical physics at Stanford University and founding director of the Stanford Institute for Theoretical Physics.

His research interests are string theory, quantum field theory, quantum statistical mechanics and quantum cosmology.

He is a member of the US National Academy of Sciences, and the American Academy of Arts and Sciences, an associate member of the faculty of Canada's Perimeter Institute for Theoretical Physics, and a distinguished professor of the Korea Institute for Advanced Study.

Susskind is widely regarded as one of the fathers of string theory.

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 a discussion with his father that changed his 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.

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).

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 important contributions in the following areas of physics:

Susskind is the author of several popular science books.

Since 1979 he has been professor of physics at Stanford University, and since 2000 has held the Felix Bloch professorship of physics.

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 co-authored a series of companion books to his lecture series The Theoretical Minimum.

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.

He was the first to give a precise string-theoretic 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, and the 2018 Oskar Klein Medal.

Leonard Susskind was born to a Jewish family from the South Bronx in New York City.

He began working as a plumber at the age of 16, taking over from his father who had become ill.

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."

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 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.

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 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.

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.