Professor Krassman is the world's leading authority in the rapidly growing field of mind control in frogs. Krassman is hired by Doc Hopper in The Muppet Movie to force Kermit the Frog to appear as a commercial spokesman for Doc Hopper's Frog Legs. In typical mad scientist fashion, Krassman is prone towards maniacal laughter, taking great joy in his work. When others join in, however, he curtails it, stating that "I detest the surfeit of provincial laughter."