[1] Born in Cleveland, Utah, Larson was the son of Danish immigrants Peter, a clothing salesman, and Nora.

[2] He worked on such films as Snow White and the Seven Dwarfs, Pinocchio, Fantasia, Bambi, The Three Caballeros, Make Mine Music, Melody Time, Cinderella, Alice in Wonderland, Peter Pan, Lady and the Tramp, Sleeping Beauty, One Hundred and One Dalmatians, The Sword in the Stone, The Jungle Book, and The Many Adventures of Winnie the Pooh.

Throughout the years, Larson has animated characters on classics like The Aristocats and Robin Hood and also provided the titles on The Rescuers (along with Mel Shaw and Burny Mattinson).

In 1973, he began a recruitment training program that brought a new generation of animators into the Disney studio.

Many well-known figures in animation today went through Larson's training program, including Brad Bird, Don Bluth, Chris Buck, Tim Burton, Randy Cartwright, Ron Clements, Andreas Deja, Gary Goldman, Ed Gombert, Mark Henn, Dan Haskett, Glen Keane, Bill Kroyer, John Lasseter, John Musker, Phil Nibbelink, Richard Rich, Burny Mattinson, Melvin Shaw, Jeffrey J. Varab, John Pomeroy, Joe Ranft, Jerry Rees, Henry Selick and Tad Stones among many others.