Question: When was the American theoretical physicist and professor of physics at the University of California, Berkeley born who encounters with Einstein Wrote Back?
Context: Julius Robert Oppenheimer (April 22, 1904 – February 18, 1967) was an American theoretical physicist and professor of physics at the University of California, Berkeley.  Oppenheimer was the wartime head of the Los Alamos Laboratory and is among those who are credited with being the "father of the atomic bomb" for their role in the Manhattan Project, the World War II undertaking that developed the first nuclear weapons used in the atomic bombings of Hiroshima and Nagasaki.  The first atomic bomb was detonated on July 16, 1945, in the Trinity test in New Mexico; Oppenheimer later remarked that it brought to mind words from the "Bhagavad Gita": "Now I am become Death, the destroyer of worlds." Mary Katharine Gaillard (born April 1, 1939) is an American theoretical physicist with a focus on particle physics.  She is a professor of the Graduate School at the University of California, Berkeley and Visiting Scientist at the Lawrence Berkeley National Laboratory.  She was Berkeley's first tenured female physicist. Einstein Wrote Back is a memoir by Canadian physicist John Moffat which documents his encounters with various other famous physicists, including Niels Bohr, Albert Einstein, Erwin Schrödinger, Fred Hoyle, Wolfgang Pauli, Paul Dirac, Abdus Salam, and J. Robert Oppenheimer, as well as his work at Imperial College London, Princeton University, CERN, and the University of Toronto. Kip Stephen Thorne (born June 1, 1940) is an American theoretical physicist, known for his contributions in gravitational physics and astrophysics.  A longtime friend and colleague of Stephen Hawking and Carl Sagan, he was the Feynman Professor of Theoretical Physics at the California Institute of Technology (Caltech) until 2009 and is one of the world's leading experts on the astrophysical implications of Einstein's general theory of relativity.  He continues to do scientific research and scientific consulting, most notably for the Christopher Nolan film, "Interstellar". Yasunori Nomura (born 1974) is a theoretical physicist working on particle physics, quantum gravity, and cosmology.  He is a Professor of Physics at University of California, Berkeley, a Senior Faculty Scientist at Lawrence Berkeley National Laboratory, and a Principal Investigator at Kavli Institute for the Physics and Mathematics of the Universe.  Since 2015, he has been the Director of the Berkeley Center for Theoretical Physics. David Jonathan Gross ( ; born February 19, 1941) is an American theoretical physicist and string theorist.  Along with Frank Wilczek and David Politzer, he was awarded the 2004 Nobel Prize in Physics for their discovery of asymptotic freedom.  David Gross is the Chancellor’s Chair Professor of Theoretical Physics at the Kavli Institute for Theoretical Physics of the University of California, Santa Barbara, and was formerly the KITP director and holder of their Frederick W. Gluck Chair in Theoretical Physics .  He is also a faculty member in the UC Santa Barbara Physics Department and is currently affiliated with the Institute for Quantum Studies at Chapman University in California.  He is a foreign member of the Chinese Academy of Sciences. Bill Sutherland (born March 31, 1942) is a notable American theoretical physicist.  He received his PhD in 1968 while studying under Nobel laureate C. N. Yang at Stony Brook.  He is best known for his work in statistical mechanics and quantum many body theory.  Early in his career he solved the six vertex model and developed an exact solution in 1967, which he then followed with the eight vertex model in 1970.  He completed his postdoctoral work at Berkeley in the 1969-1971 time frame where he became interested in inverse square potential many body interactions.  He then became a professor of physics at the University of Utah in 1971 where he worked until his retirement in 2004.  Most notably his name is associated with the Calogero-Sutherland model which is a major research area in theoretical physics and mathematics. Chris Quigg (born December 15, 1944) is an American theoretical physicist at the Fermi National Accelerator Laboratory (Fermilab).  He graduated from Yale University in 1966 and received his Ph.D. in 1970 under the tutelage of J. D. Jackson at the University of California, Berkeley.  He has been an associate professor at the Institute for Theoretical Physics, State University of New York, Stony Brook, and was head of the Theoretical Physics Department at Fermilab from 1977 to 1987. John Clements Collins (born 1949) is a British-born American theoretical physicist and professor of physics at Pennsylvania State University.  He attended the University of Cambridge where he obtained a B.A. in mathematics 1971 and a Ph.D. in theoretical physics in 1975.  He worked as a postdoc and assistant professor from 1975 to 1980 at Princeton University.  Collins was part of the faculty of the Illinois Institute of Technology from 1980 to 1990.  From 1990 to the present, he has been a faculty member in the department of physics at Pennsylvania State University where he currently holds the position of Distinguished Professor. Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist.  Einstein developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).  Einstein's work is also known for its influence on the philosophy of science.  Einstein is best known by the general public for his mass–energy equivalence formula "E" = "mc" (which has been dubbed "the world's most famous equation").  He received the 1921 Nobel Prize in Physics "for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect", a pivotal step in the evolution of quantum theory.
Answer: April 22, 1904