Jean Frances Tatlock (February 21, 1914 – January 4, 1944) was an American psychiatrist and physician. She was a member of the Communist Party of the United States of America and was a reporter and writer for the party's publication Western Worker. She is also known for her romantic relationship with J. Robert Oppenheimer, the director of the Manhattan Project's Los Alamos Laboratory during World War II. The daughter of John Strong Perry Tatlock, a prominent Old English philologist and an expert on Geoffrey Chaucer, Tatlock was a graduate of Vassar College and the Stanford Medical School, where she studied to become a psychiatrist. Tatlock began seeing Oppenheimer in 1936, when she was a graduate student at Stanford and Oppenheimer was a professor of physics at the University of California, Berkeley. As a result of their relationship and her membership of the Communist Party, she was placed under surveillance by the FBI and her phone was tapped. She suffered from clinical depression and died by suicide on January 4, 1944. Early life Jean Frances Tatlock was born in Ann Arbor, Michigan, on February 21, 1914, the second child of John Strong Perry Tatlock and his wife Marjorie Fenton. She had an older brother named Hugh, who became a physician. Her father, who had a PhD from Harvard University, was a noted and acclaimed professor of English at the University of Michigan; an Old English philologist; an expert on Geoffrey Chaucer and English plays, poems, and Elizabethan era literature; and author of approximately 60 books on those subjects, including The Complete Poetical Works of Geoffrey Chaucer (1912) and The Mind and Art of Chaucer (1950). John Tatlock was a professor of English at Stanford from 1915 to 1925, and Harvard from 1925 to 1929, before returning to the Bay Area as a professor of English at the University of California, Berkeley. Tatlock attended Cambridge Rindge and Latin School in Cambridge, Massachusetts, and Williams College in Berkeley. In 1930, she entered Vassar College. She graduated in 1935, and returned to Berkeley, where she took courses to complete the prerequisites for Stanford Medical School, and was a reporter and writer for the Western Worker, the Communist Party of America's organ on the West Coast of the United States. She was accepted into Stanford Medical School (then located in San Francisco), where she studied to become a psychiatrist. She graduated from Stanford with the