While as an artist-illustrator living in the Bronx, New York City, Huemer first began his career in animation at the Raoul Barré cartoon studio in 1916.
Later he moved to Hollywood and worked as an animator and director for the Charles Mintz studio creating the character Scrappy.
He subsequently moved to the Disney Studio, where he remained for the duration of his career, except for a three-year hiatus from 1948–51 when he pioneered animated TV commercials and created with Paul Murry The Adventures of Buck O'Rue comic strip.
[2] Some of Huemer's most creative work was done in partnership with Joe Grant; examples include Fantasia (story director), Dumbo (screenplay), and several propaganda films to advance the U.S. war effort during World War II.
Huemer was given a Mousecar by the Disney Studio in February 1973 at a ceremony attended by a number of his peers.