Gilbert has edited 17 feature films as well as television shows and short films. John Gilbert"s first position in film was with Government filmmaking body The National Film Unit, in his native New Zealand. Gilbert was taking a break from history and anthropology studies at the time, but never returned to university, moving on to Television New Zealand, where he worked as an assistant editor and editors
Gilbert also spent time freelancing as a sound editors
Gilbert"s first cr as an editor on a full-length feature was for the film Crush (1992), which was invited to the Cannes Film Festival. As noted previously, he was widely recognized for his editing of The Lord of the Rings: The Fellowship of the Ring, directed by Peter Jackson.
He received a New Zealand Screen Award for editing The World"s Fastest Indian (2005). Gilbert has been elected to membership in the American Cinema Editors.