[1] During his career, which spanned from the 1940s until 2010, his client list at CAA and other agencies included Bette Davis, Jack Lemmon, Bobby Darin, Bo Derek, Richard Attenborough, Red Buttons, Maggie Smith and Rock Hudson.
[1] He enlisted in the U.S. Army during World War II while still in high school, taking part in the Allied Normandy landings in France.
[1] His client Gig Young won the Academy Award for Best Supporting Actor for his role in They Shoot Horses, Don't They?.
Baum proved instrumental in packaging together three of his clients, James Poe, actor Sidney Poitier and director Ralph Nelson to create the 1963 film Lilies of the Field.
[2] Baum's credits as a producer included The Last Valley, Bring Me the Head of Alfredo Garcia, The Wilby Conspiracy and The Killer Elite, all of which were released in the 1970s.
[3] [2] Baum brought an extensive client list to the CAA when he joined the agency, including Peter Sellers and Sidney Poitier.
In addition to Sidney Poitier and Gig Young, his clients included Carroll O'Connor, Dyan Cannon, Gene Wilder, Julie Andrews, Richard Harris, Richard Attenborough, Maggie Smith, Harry Belafonte, Stockard Channing, Joanne Woodward, John Cassavetes, Jack Lemmon, Blake Edwards, Bette Davis, Gena Rowlands, Rod Steiger, Cliff Robertson and Red Buttons at various times throughout his career.