Warshofsky was born David A. Warner in San Francisco, California. He changed his surname back to "Warshofsky," which was his family's original name. Since 1989, Warshofsky has appeared in films and television series, such as episodes of Law & Order, ER, Commander in Chief, Without a Trace, The Mentalist, and Tarzan, and films such as Running Scared, Welcome to Collinwood, The Bone Collector, Face/Off, Unstoppable, and There Will Be Blood.