 In Los Angeles, Olson was head writer for several HBO comedy specials, staff writer for the Screen Actors Guild Awards for three years, co-wrote (with Kevin Meaney) an award-winning series for Comedy Central in London and was head writer or staff writer for many animated series voiced by his comedian friends, notably "Rocko's Modern Life" for Nickelodeon.He was head writer for the first season of the Disney animated series "Phineas and Ferb".In 1992 Olson became staff writer and occasional songwriter for Nickelodeon's animated series Rocko's Modern Life.