Grunberg has had a multiple-episode arc on NYPD Blue and recurring roles on both Melrose Place and Flying Blind. His other television credits include Diagnosis Murder and Murphy Brown, Stolen: One Husband and Dean Koontz's Mr. Murder.

Grunberg created and ran a successful frozen yogurt delivery service, worked for noted film producers Dino de Laurentiis and Joel Silver, and co-wrote a computer animated pilot in which he also provided the voice of the lead character.

Grunberg acted in plays during elementary and junior high school, graduating from University High School in West Los Angeles. He majored in business at San Diego State University and UCLA. He currently lives outside Los Angeles with his wife and two young sons.