 Larry Shaw, the "Prince of Pi", invented the holiday Pi Day in 1988 while at the Exploratorium.During an off-site staff retreat in 1988, he started talking with his co-workers, like Ron Hipschman, about the mysteries of mathematical constants.Shaw came up with the idea to link pi (3.14159…), which begins with 3.14, with the date 3/14 or March 14.