Actor Writer Art Department
- Gender: Male
- Birthday: 1910-01-31
- Day of Death: 1984-12-07 ( 74 years old )
- Place of Birth: Worthington, Indiana, USA
- Also Known As: Winfield B. Mercer / Jack B. Mercer
His parents were actors, but Jack decided to pursue his love of art. He got a job as an inbetweener (rookie animator) at the Fleischer studio. Dave Fleischer happened to hear him singing the Popeye theme song in a funny voice, and asked Jack to try voicing one cartoon. He later became a writer at the Fleischer studio.