Steve Warren was born in Philadelphia, Pennsylvania, USA as Stephen Craig Monheimer. After decades of work as an entertainment journalist, he took up acting as a "midlife crisis career." He is known for his work in Scarce (2008), The Walking Dead (2010-11), The Last Day in November (2002) and The Signal (2007).
He acquired the nickname "thinhead" as a college d.j. name after actress Sylvia Sidney, at a party during her tour in "The Matchmaker," told him, "You have the thinnest head I've ever seen.".