Fred S. Keller

Fred Simmons Keller (January 2, 1899 – February 2, 1996) was an American psychologist and a pioneer in experimental psychology. He taught at Columbia University for 26 years and gave his name to the Keller Plan, also known as Personalized System of Instruction, an individually paced, mastery-oriented teaching method that has had a significant impact on college-level science education system. He died at home, age 97, on February 2, 1996, in Chapel Hill, North Carolina.