John Stuart Foster (May 30, 1890 – September 9, 1964) was a Canadian physicist. Biography Born in Clarence, Nova Scotia, he completed his Ph.D. at Yale University with a dissertation on the first measurements of the Stark effect in Helium. In 1924 he gained an appointment as assistant professor at McGill University in Montreal, where he taught physics. He became associate professor in 1930. During World War II he served as a liaison officer for the National Research Council, working at the MIT-run Radiation Laboratory on radar research and development. He developed a fast-scan radar antenna that became known as the "Foster scanner". He returned to McGill in 1944, where he directed the construction of a 100-MeV cyclotron. This instrument was commissioned in 1949. At the time this was the second largest in the world. From 1952 until 1954 he was chairman of the physics department at McGill. He died in Berkeley, California. Legacy The John Stuart Foster Radiation Laboratory and Cyclotron at McGill was named after him in 1964 and this is engraved on the side of the building now known as the M. H. Wong Building. His son, John Stuart Foster Jr., graduated from the University of California in 1948, then became director of the Lawrence Livermore National Laboratory, director of Defense Research and Engineering for the U.S. Defense Department, and Vice President of T.R.W., Inc. Awards and honors Fellow of the Royal Society of Canada, 1929. Awarded Levy Medal, Franklin Institute, 1930. Henry Marshall Tory Medal, 1946. Elected a Fellow of the Royal Society of London, 1935. The crater Foster on the Moon is named after him. References External links Canadian Encyclopedia entry Foster Radiation Laboratory and Cyclotron Building 1890 births 1964 deaths People from Annapolis County, Nova Scotia Yale Graduate School of Arts and Sciences alumni Canadian physicists Canadian people of British descent Canadian Fellows of the Royal Society Fellows of the Royal Society of Canada Fellows of the American Physical Society McGill University faculty