Larry Shaw (1939 – 2017) the founder of Pi Day, at the Exploratorium in San Francisco.

Pi Day is an annual celebration of the mathematical constant
π (pi). Pi Day is observed on March 14 (the 3rd month) since
3, 1, and 4 are the first three significant figures of π, and it
was first celebrated in the United States. It was founded in
1988 by Larry Shaw a physicist at the San Francisco science
museum, the Exploratorium. Celebrations often involve eating
pie or holding pi recitation competitions. In 2009, the United
States House of Representatives supported the designation
of Pi Day.