You can read the full story here.
Along with his brother, Sid, Marty was half of Sid & Marty Krofft Productions. They began as theatrical puppeteers before moving into television by designing the characters and sets for The Banana Splits Adventure Hour for Hanna-Barbera. That allowed them to branch out on their own to create H.R. Pufnstuf, The Bugaloos, Lidsville, Sigmund and the Sea Monsters, both versions of Land of the Lost, Far Out Space Nuts, The Lost Saucer, The Krofft Supershow which included Dr. Shrinker, Electra Woman and Dyna Girl, Kaptain Kool and the Kongs, Wonderbug, Bigfoot and Wildboy and Magic Mongo, and Pryor’s Place.