Born in Cleveland, Utah, Larson was the son of Danish immigrants and worked on such films as Snow White and the Seven Dwarfs, Pinocchio, Fantasia, Bambi, Cinderella, Alice in Wonderland, Peter Pan, Lady and the Tramp, Sleeping Beauty, 101 Dalmatians, The Sword in the Stone, and The Jungle Book. 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 the 1980s his work was minor, but he has been an animation consultant on animated films and shorts like The Fox and the Hound, Mickey's Christmas Carol, The Black Cauldron, and The Great Mouse Detective.
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.
Larson was married to Gertrude Larson, who died of cancer in 1975. He retired from Disney in September 1986 and died two years later.
- 3 Little Pigs (Three Little Pigs)
- Forest Animals, Whistle While You Work Sequence, Dwarfs on deer (Snow White and the Seven Dwarfs)
- Figaro, Cleo (Figaro lick Cleo and Cleo going into castle), French Can-can dancers marionettes and Russian girl marionette, Donkeys (Pinocchio)
- Pegasus, Centaurs, Centaurettes (The Pastoral Symphony) (Fantasia)
- Bambi, Thumper (Bambi)
- "The Flying Gauchito", Donald Duck, José Carioca (The Three Caballeros)
- Brer Rabbit, Brer Fox and Brer Bear (Song of the South)
- "Once Upon a Wintertime", "Johnny Applesead", "Little Toot" (Melody Time)
- Mr. Toad, Ichabod Crane (The Adventures of Ichabod and Mr. Toad)
- Cinderella, Prince Charming (Cinderella)
- Alice, Dinah, The Caterpillar, The Cheshire Cat, The Queen of Hearts, Flamingo (Alice in Wonderland)
- Flying to London Sequence, Peter Pan, Wendy Darling, Captain Hook (Peter Pan)
- Lady, Tramp, Peg, Beaver (Lady and the Tramp)
- Forest Sequence, Three Good Fairies: Flora, Fauna, and Merryweather (Sleeping Beauty)
- Pongo, Perdita, Puppies, Colonel, Tibbs (101 Dalmatians)
- Wart, Merlin, Archimedes, Sir Ector, Madame Mim (The Sword in the Stone)
- birds, rabbits, squirrels, butterflies, deer, racers (Mary Poppins)
- The Vultures, some of the Wolves (The Jungle Book)
- Roquefort, Scat Cat (The Aristocats)
- Little John, Vultures (Robin Hood)
- Kanga and Roo (The Many Adventures of Winnie the Pooh)
Note: At the time these films were produced it was common for an animator to animate every character in the shot.