Frank Grundeen studied at the National Academy of Design and was an animator with the Walt Disney Studios in the 1930s and 1940s. He participated in the the Disney features 'Dumbo', 'Fantasia', 'Bambi' and 'Pinocchio'. He did comic book artwork for Standard Comics in the late 1940s. He spent most of the 1940s, 1950s and 1960s working as a commercial illustrator.
Grundeen then worked on the 'Donald Duck' daily and Sunday comic from 1967 to 1976. He began as Al Taliaferro's inker, but he took over the artwork completely in 1969. Throughout his run, the gags were written by Bob Karp and later Greg Crosby. It is possible, according to info from ancestry.com, that his full name was John Franklin Grundeen, and that he passed away in 1986.