His first onscreen appearance was on the television series The Torkelsons in 1992, where he played a jock. He appeared in small roles before appearing as a guest star in Sisters in 1993 where he played Conifer in the episode "Demons". He continued to make small appearances on television shows and movies before making his big screen debut as Billy in the George Lucas produced Radioland Murders in 1994. Campbell appeared in four episodes of Christy from 1994 to 1995. Campbell continued his work in television with a multi-episode arc as EMT Riley Brown on the hit NBC drama, ER.[2]
Campbell has produced and directed several short films, the first in 2009 with Waiting for Jevetta which he co-directed and produced with Judith Benezra. In 2010 he produced the short film The Riverside Shuffle. In 2011, Campbell co-produced and co-directed the short films Shooting for Tomorrow, Shooting for Something Else and Tomorrow's End. Campbell received multiple awards for the short films Shooting for Tomorrow and Shooting for Something Else, including the categories Best Short Film, Best Short Film and Best Experimental Short. Shooting for Tomorrow won Best Short Film at the Los Angeles Film Festival.
Won–Los Angeles First Glance Film Festival Award for Best Director Won–Los Angeles First Glance Film Festival Award for Best Short Film Won–Los Angeles Movie Awards for Best Experimental Short Won–Missoula International Wildlife Film Festival with Merit Award for Script