Eastman was born in Montreal in 1967 and moved with his family to Los Angeles when he was five. Deciding while he was attending Schurr High School in Montebello that he wanted to be an actor, he studied drama and appeared in numerous high school productions. After graduating he landed his first job as an extra in the television musical "Have you tried talking to Patty". Eastman has starred in several films, and his best-known film role is in the 1987 hit horror film A Nightmare on Elm Street 3: Dream Warriors as Joey Crusel. In 1988, he reprised his role in the sequel A Nightmare on Elm Street 4: The Dream Master. His other films include Deadly Weapon, Mobsters, The Opposite of Sex and Knight to F4.
Eastman has also made many guest appearances on television shows, including Highway to Heaven, Charles in Charge, Melrose Place, CSI: Crime Scene Investigation, Babylon 5 (as "Kiron Maray" in season one episode "The War Prayer", 1994), as "Sammael" in season one episode 18 of Chris Carter's Millennium, The Protector, Renegade, ER and Sliders. He also appeared as "Lee Sekelling" in The Mentalist.
