Lowell S. Brown (born 1934) is an American theoretical physicist, a retired Staff Scientist and Laboratory Fellow at Los Alamos National Laboratory, and Professor Emeritus of physics at University of Washington. He was a student of Julian Schwinger at Harvard University and a recipient of the John Simon Guggenheim Memorial Foundation Fellowship. Brown authored a book on Quantum Field Theory that has received over 5,000 citations, and he has authored or co-authored over 150 articles that have accumulated over 11,000 citations. Education and career Lowell S. Brown earned his A.B. in physics from the University of California, Berkeley in 1956 and his Ph.D. in physics from Harvard University in 1961, with a National Science Foundation Predoctoral Fellowship, studying quantum field theory under Julian Schwinger. After National Science Foundation Postdoctoral Fellowships at Istituto di Fisica Dell'Universita in Rome and at Imperial College of Science and Technology in London, Brown joined Yale University as an Associate Professor through 1968. For most of his career, Brown served as a Professor at the University of Washington (1969-2001). Then, he was a Staff Scientist at Los Alamos National Laboratory in New Mexico (2001-2014). He is now a Guest Scientist at Los Alamos. Brown again visited Imperial College in 1971-1972, continuing his research with a National Science Foundation Senior Postdoctoral Fellowship. He was awarded a John Simon Guggenheim Memorial Foundation Fellowship in 1979 and undertook his research at the European Organization for Nuclear Research (CERN), Geneva, Switzerland, and the Institute for Advanced Study, Princeton, New Jersey. Scientific contributions Most of Brown's work has involved quantum field theory applied to elementary particle physics, astrophysics, general relativity, plasma physics, atomic physics, and nuclear physics. His book "Quantum Field Theory" (1994) has been well received. Pierre Ramond's review in Science states that Brown's book is "marked by its astute choice of topics as well as by the clarity with which they are expounded, it is akin to a toolbox for students of modern quantum field theory... a very thorough and rare treatment...a very interesting and original textbook. I strongly recommend this book to whoever aspires to become either a particle or a condensed matter physicist." Brown's work on the interaction of intense laser beams with electrons (Brown & Kibble 1964) is still cited forty or so years later. In astrophysics and general relativity, his work on the stress–energy tensor of various fields coupled to an arbitrary classical gravitational field