David Leach has been editing films for over 35 years, having graduated from the film school at York University, Toronto, in 1974. From 1971 to 1994, he cut commercials, documentaries, and dramatic television series in Canada, working in both 16mm and 35mm. He was supervising editor of TV drama series, and producer/director of several short films. He experienced first hand the shift in post-production technology from film to computer-controlled linear video, then non-linear tape-based editing systems and finally to the digital world of today.

Since moving to New Mexico in 1991 he has edited numerous episodes of television documentary series for TBS, TLC, National Geographic, Discovery, PBS and Hallmark, and has also edited several independent feature-length documentaries.