Greg has sung in numerous choruses around the country, including several college and high school choirs, Cantari in Columbus, Ohio; Camarata in Urbana, Illinois; the Skyline Chorus in San Mateo; the Atlanta Symphony Orchestra Chorus; and The Santa Cruz Chorale.

Greg has long experience in musical theater, with roles including John Truitt in Meet Me In St. Louis, Orphan in Celebration, Teen Angel in Grease, and Riff Raff in The Rocky Horror Show.