He co-wrote the number-one hit "Green-Eyed Lady" for the band Sugarloaf in 1970, and released his first solo album in 1974 called Medicine Wheel.

He later became a producer for television shows that appeared on the A&E network, was the VP of media at Integral Life and the director of the Ken Wilber Biography Project.

[17] Voyeur was also the winner of the awards for Best Female Actor (Grace Zabriskie), Best Male Actor (Robert Culp), and other Philips CD-i products that Riordan had directed also won awards, such as Best Comedy winner The Wacky World of Miniature Golf, and two others.

[9] Over his career he was credited for producing, designing or directing over twenty video games and interactive movies.

[9] In 2001, Riordan was the managing editor of the One World Journeys website, which published photo-documentaries of eco-expeditions in environmentally sensitive regions.

[21] From 2007 to 2018 he was the vice president of media for Integral Life responsible for creating personal development programming, documentaries and public conferences.

[citation needed] He is currently the director of Story Studio TV, a convergence transmedia company creating television and web programming.