Stevenson was born in Los Angeles, California to Lewis Stevenson and Helen Davis Stevenson. His maternal great-grandfather Jesse W. Fell was a close friend and campaign manager for Abraham Lincoln. His oldest son Adlai Stevenson III became a United States Senator from Illinois from 1970 until 1981. He grew up in Bloomington, Illinois. He studied at Bloomington High School until his junior year. After that he went at University High School in Normal, Illinois. Then he studied at Princeton University and Northwestern University Law School.