List of Famous people born in Illinois, United States of America

Edward Claude Cassidy was an American jazz and rock drummer who was one of the founders of the rock group Spirit in 1967.

James P. Liautaud was an American industrialist, inventor and business theorist. He is the father of Jimmy John's founder Jimmy John Liautaud. Liautaud provided his son with the seed money to start his restaurant business in 1983.

Ian Brennan is an American screenwriter, director and actor. He is known for his work on the American television shows Glee, Scream Queens and The Politician.

Irun Cohen is an immunologist at the Weizmann Institute of Science, Israel. He moved from the U.S. to Israel in 1968.

John Myrick Dawson was an American computational physicist and the father of plasma-based acceleration techniques. Dawson earned his degrees in physics from the University of Maryland, College Park: a B.S. in 1952 and Ph.D. in 1957. His thesis "Distortion of Atoms and Molecules in Dense Media" was prepared under the guidance of Zaka Slawsky.

Steven E. Levitan is an American director, screenwriter, and producer of television comedies. He has created such TV series as Just Shoot Me!, Stark Raving Mad, Stacked, Back to You, and Modern Family.

Mayo Jane Methot was an American film and stage actress. She appeared in over 30 films, as well as in various Broadway productions, though she attracted significant media attention for her tempestuous marriage to actor Humphrey Bogart.

John Hopkin Nuckolls is an American physicist who worked his entire career at the Lawrence Livermore National Laboratory. He is best known for the development of inertial confinement fusion, which is a major branch of fusion power research to this day. He was also the lab's director from 1988 until 1994, when he resigned to become an Associate Director at Large. He was awarded the Ernest Orlando Lawrence Award in 1969, the James Clerk Maxwell Prize for Plasma Physics in 1981 and the Edward Teller Award in 1991.

John Lee Mahin was an American screenwriter and producer of films who was active in Hollywood from the 1930s to the 1960s. He was known as the favorite writer of Clark Gable and Victor Fleming. In the words of one profile, he had "a flair for rousing adventure material, and at the same time he wrote some of the raciest and most sophisticated sexual comedies of that period."

John Byrum is an American film director, and writer known for The Razor's Edge, Heart Beat, Duets and Inserts.