- Glenn Leopold was born on July 26, 1948 in Mount Vernon, New York, USA. He is a writer and producer, known for The Smurfs (1981), The Prowler (1981) and The Real Adventures of Jonny Quest (1996).
- While working on Jonny Quest Real Adventures, Glenn Leopold created villains like Ezekiel Rage, twin daughters of Zin, and Elise.
- With Producer Davis Doi, Glenn Leopold developed the Hanna Barbera show "SWAT Kats" for Television.
- While working on The Smurfs as Story Editor/Writer, Glenn Leopold created characters like The Clockwork Smurf and Clockwork Smurfette. Glenn Leopold created Clockwork Smurf in Season 1 and Clockwork Smurfette in Season 7.
- Glenn Leopold is one of the co-creators of Grandpa Smurf (The Smurfs Season 6) and Nanny Smurf (mentioned in The Smurfs Season 6 and introduced in The Smurfs Season 8).
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