Martin Theodore Orne, M.D., Ph.D. (October 16, 1927, Vienna, Austria – February 11, 2000, Paoli, Pennsylvania) was a professor of psychiatry and psychology at the University of Pennsylvania. Orne is best known for his pioneering research into demand characteristics illustrating the weakness of informing participants that they are taking part in a psychology experiment and yet expecting them to act normally. As well as his involvement with the poet Anne Sexton, and the trials of Patty Hearst, and Kenneth Bianchi. He was also well known as a researcher in the field of hypnosis.
Orne was born on October 16, 1927 to Dr. Frank Orne, a surgeon and Martha Brunner, a psychiatrist in Vienna, Austria. His family moved from Austria to escape the Nazi Anschluss and relocated to New York City in 1938. He studied at the Bronx High School of Science. He later moved to Boston and studied at Harvard University. Orne enlisted in the U.S. Army during World War II and returned to Harvard afterward. He graduated cum laude in 1948. While at Harvard, he studied under the psychologists Henry Murray and Robert White. Orne received his M.D. degree from Tufts University Medical School in 1955, with a residency in psychiatry at Massachusetts Mental Health Center. In 1958, he received his Ph.D. in psychology from Harvard University.
Orne founded and directed the Unit for Experimental Psychiatry at the University of Pennsylvania. He was a professor at the University of Pennsylvania for 32 years. In 1996, he became a Professor Emeritus. At the time of his death, Orne was an Adjunct Professor Emeritus in Psychology and Professor Emeritus in Psychiatry at the University of Pennsylvania.