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**Details of the exhibit E.G.D Cohen: A Leader in Statistical Physics**

Idea, design: Olga Nilova, Special Collections Librarian

Photo by Lubosh Stepanek

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**Details of the exhibit E.G.D. Cohen: A Leader in Statistical Physics**

Idea, design - Olga Nilova, Special Collections Librarian

Photo by Lubosh Stepanek

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**Details of the exhibit E.G.D. Cohen: A Leader in Statistical Physics**

Idea, design - Olga Nilova, Special Collections Librarian

Photo by Lubosh Stepanek

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**Details of the exhibit E.G.D. Cohen: A Leader in Statistical Physics**

**Dr. E.G.D. Cohen at the 2007 Honorary Degree Dinner**

Dr. E.G.D. Cohen retired from Rockefeller in 1993 but remained scientifically active. He moved to Iowa City, Iowa, in 2015 to be near his family even as he continued to collaborate and publish through 2016. His last paper was published in August of 2017 in *Physical Review*.

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**Schematic diagram of a dilution refrigerator**

Source: Wikipedia, the free encyclopedia

Early in his career, Dr. E.G.D. Cohen predicted the possibility of an incomplete phase separation in liquid helium mixtures at very low temperatures that was later discovered experimentally, leading to the design of the helium dilution refrigerator, one of the basic low-temperature instruments available.

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**Cohen, Stanley Win Boltzmann Medals, Physics Today, July 2004**

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**The Boltzmann Medal**

In 2004, Dr. E.G.D. Cohen won the Boltzmann Medal from the Committee on Thermodynamics and Statistical Mechanics of the International Union of Pure and Applied Physics. The medal, awarded every three years, is the highest award in the field of statistical mechanics.

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**Dr. E.G.D. Cohen. Reminiscences of World War II. **Interview by Erica Sigmon, 2004

Between the summer of 1945 and today, like my father, I have attempted to complete a family story. In my case it was the circumstances of my parents’ murder in Auschwitz in 1943. Right at the end of World War II, I started my search for information about when and where they died. I wrote to the International Red Cross, the Auschwitz Memorial, Yad Vashem, and many other organizations that were recommended to me that could provide more information. On 24 July 2000, I received final confirmation from the American Red Cross about the fate of my parents:

*“On 7 August 1943, they were brought to Westerbork transit camp, penal barrack 67. On 7 September 1943 they were deported from Westerbork to concentration camp Auschwitz. Both parents of the inquirer died on 10 September 1943 at Auschwitz or in the neighborhood of Auschwitz.”*

E.G.D. Cohen. Introduction to *The Cohen Book*

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**Physics search expands RU's drive to recruit new faculty. News&Notes**

Dr. E.G.D. Cohen was invaluable at lectures, conferences, and meetings. His questions, sometimes numerous, were insightful and penetrating. Speakers would often learn something beneficial to their work, such as suggestions for new ideas and directions to consider, when questioned by Dr. Cohen.

He was passionate about education and sharing his knowledge. He spent time as a visiting professor at several universities over the years, including the University of Florida, the University of Delaware, the Australian National University, and a handful of institutions in Europe. In addition to English and Dutch, he spoke German, Italian, and French, which he learned by studying a dictionary while hiding out during the war.

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**Dr. E.G.D. Cohen in 1992**

Photo by Robert Reichert

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**SPEED LIMIT sign on campus of The Rockefeller University,** circa 1990s

Courtesy of the Cohen family

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**Jan de Boer at the time of his retirement in 1981**

Jan de Boer, Dutch physicist, has been E.G.D. Cohen’s doctoral advisor and the founder of the Institute for Theoretical Physics at the University of Amsterdam.

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**The Boltzmann Equation: Theory and Applications/Edited by E.G.D. Cohen.** Wien, 1973

In 1872, Boltzmann published a paper which for the first time provided a precise mathematical basis for a discussion of the approach to equilibrium. The paper dealt with the approach to equilibrium of a dilute gas and was based on an equation - the Boltzmann equation, as we call it now - for the velocity distribution function of such a gas. The Boltzmann equation still forms the basis of the kinetic theory of gases and has proved fruitful not only for the classical gases Boltzmann had in mind, but also- if properly generalized - for the electron gas in a solid and the excitation gas in a superfluid. Therefore it was felt by many of us that the Boltzmann equation was of sufficient interest, even today, to warrant a meeting, in which a review of its present status would be undertaken. Since Boltzmann had spent a good part of his life in Vienna, this city seemed to be a natural setting for such a meeting. historical lectures, since it was generally felt that apart from their general interest, they would furnish a good introduction to the subsequent scientific sessions.

Twenty-three invited lectures were presented at the Symposium, and all are included in this volume. --- E.G.D. Cohen, W. Thirring

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**Dr. E.G.D. Cohen with children: daughter Andrea (sitting on his lap), son Michael (standing next to him), and nephew Martijn ca. 1960s**

Courtesy of the Cohen family

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**Dr. E.G.D. Cohen,** circa 1963

Photograph from the university's phone directory, 1968

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*The Rockefeller Institute Review***, Fall 1963**

An announcement about the Dr. E.G.D. Cohen appointment as a Professor in the Rockefeller Institute.

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* Fundamental Problems in Statistical Mechanics/ edited by E.G.D. Cohen*, 1962

E.G.D. Cohen was a founder of a student society, Sirius, at the University of Amsterdam and a summer school that brought together physicists from across the Netherlands and later Europe. He edited a number of books, including the series *Fundamental Problems in Statistical Mechanics I–VI*, which contains an account of the developments in his field throughout the 1960s, 70s, and early 80s.

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**University of Amsterdam: The old school building in the Roetersstraat, the housing of the ITF (Institute of Theoretical Physics) until 1963**

Source: History of the ITFA

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*E.G.D. Cohen at the beginning of his career, circa 1960s*

Courtesy of the Cohen family

After E.G.D. Cohen earned his B.Sc. and Ph.D. degrees at the University of Amsterdam, he was a postdoc at the University of Michigan and Johns Hopkins University, and then a faculty member at the Institute of Theoretical Physics at the University of Amsterdam before joining Rockefeller as a professor in 1963.

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**Dr. E.G.D. Cohen during the Ph.D. ceremony, **1957

Courtesy of the Cohen family

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**Dr. E.G.D. Cohen during the Ph.D. ceremony with his wife, Marina A. Cohen (Rietje)**, 1957

Courtesy of the Cohen family

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**Roetersstraat 1a (1951). **From left to right:** R. van Wageningen, R. Bird, J. van Kranendonk, J. de Boer, E.G.D. Cohen.**

Courtesy of **A.J. Kox**

E.G.D. Cohen received his B.Sc. at the University of Amsterdam in 1952 and his Ph.D. at the University of Amsterdam in 1957** **

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**Wedding of E.G.D. Cohen and Marina Rietje, ca. 1950**

Courtesy of the Cohen family

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*The Cohen book: the history of a Dutch Jewish family from the 17th to the 20th century*** / by Dr. D.E. Cohen; translated and annotated by Sam Herman,**** **2016

*Today, on my fiftieth birthday, I present to you and to the two boys this document which I have worked on for more than twenty-five years. My reasons for undertaking this study are first of all the enjoyment that I found in tracing the history and genealogy of our family, but also because I encountered so many exceptionally talented people in our lineage who may serve as examples to later generations, because of the cultural-historical value of the story of a Dutch Jewish family spanning nearly three centuries, and by this effort to strengthen the family connection, and last but not least, to honor our parents and forebears to that our lineage may “blossom like an olive tree.”*

*To my wife and my children.*

Dedication by Dr. D.E. Cohen

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**Dr. E.G. D. Cohen’s parents: David Ezechiel Cohen and Sophia Louisa de Sterke**, circa 1920s.

100 years ago, on January 16^{th}, 1923, Ezechiel Godert David “Eddie” Cohen, the Professor Emeritus at The Rockefeller University and leader in statistical physics and non equilibrium statistical mechanics, was born in Amsterdam, the Netherlands, into a Jewish family. His father, David Ezechiel Cohen, studied medicine in Amsterdam and after receiving his Ph.D. in 1913, specialized in dermatology. In 1921 he married the history teacher Sophia Louisa de Sterke. They had two children: Ezechiel Godert David “Eddie” and his brother, Carel Lodewijk David Cohen (now de Sterke), born in 1924. In 1942, during the German occupation of the Netherlands, the family was forced to go into hiding and was separated; Eddie and his brother escaped the fate of their parents, who were betrayed and perished in Auschwitz in 1943.

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**Old Amsterdam**, ca. 1900s

Source: Black and White Photography Magazine

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