Gunton was born in Santa Monica, California, the son of Rose Marie (née Banouetz) and Robert Patrick Gunton, Sr., a labor union executive. He attended Mater Dei High School in Santa Ana, California and the University of California, Irvine.
His movie debut was Revolver back in 198 and went into television by 1988.
- The Perfect Storm
- Desperate Housewives
- The Batman