For Disney, he was best known for voicing Piglet in the Winnie the Pooh franchise, and currently holds the record for the longest running voice actor to ever voice a Winnie the Pooh character, having voiced Piglet for 37 years until his death.
He also voiced the Porcupine in The Fox and the Hound, the Deacon Owl in The Rescuers, Sexton Mouse in Robin Hood, and Rudy in The Emperor's New Groove. He even played Wally Thorpe in Midnight Madness.
On June 25, 2005, John Fiedler died at the Lillian Booth Actors' Home in Englewood, New Jersey at the age of 80. John had finished recording his lines for Piglet in Pooh's Heffalump Movie, which was released in February 2005, just 4 months before his death and he had reprised his role as Piglet for the direct-to-video sequel, Pooh's Heffalump Halloween Movie, but died before he could finish recording all of his lines, to which Travis Oates (Piglet's current voice actor) recorded. John was never married and was survived by his brother, James Fiedler, and his sister, Mary Fiedler-Dean. John's Winnie the Pooh co-star Paul Winchell died the day before he did on June 24, 2005.