Mr. Gerald is a character on the Netflix series Fuller House, portrayed by Stephen Tobolowsky. He appears in the episode "The Not-So-Great Escape".
Quote: "Remain calm but as you're fleeing for your lives, please take notice of how your projects are reacting to the presence of H2O!"
Mr. Gerald is Jackson and Ramona's science teacher at Van Atta Junior High school.
Mr. Gerald teaches at the same school that D.J., Kimmy, and presumably Steve Hale attended, Van Atta Junior High.