Louis Leithold, American mathematician and academic (born 1924)

Louis Leithold was an American mathematician and teacher. He is best known for authoring The Calculus, a classic textbook about calculus that changed the teaching methods for calculus in world high schools and universities. Known as "a legend in AP calculus circles," Leithold was the mentor of Jaime Escalante, the Los Angeles high-school teacher whose story is the subject of the 1988 movie Stand and Deliver.

April 29 is the 119th day of the year in the Gregorian calendar; 246 days remain until the end of the year.