Greenburg began his affiliation with Richard Dean Anderson by producing the hit series MacGyver for five of its seven seasons on ABC.Greenburg and Anderson created Gekko Film Corp together. Greenburg has been executive producer of many projects starring Anderson, including Legend, two MacGyver television films for ABC (Trail to Doomsday and The Lost Treasure of Atlantis), and Stargate SG-1. Greenburg had a cameo appearance Stargate SG-1s 100th episode "Wormhole X-Treme!".