Jack Geller is the father of Ross Geller and Monica Geller and husband to Judy Geller. He is best known for his ill-timed, inappropriate comments, such as addressing Emily's father while in London as a "thieving, would-be-speaking-German-if-it-weren't-for-us, cheap little man". He often tries to get himself out of these things using the line 'I'm just saying...' He led his in-laws to believe that he's an attorney, although his line of work is never defined. He secretly smoked cigarettes, claiming that the cigarettes Ross found around the house were Judy's. His inappropriate comments often were based on sexual themes, such as when he started discussing Monica and Chandler's sexual strategies for getting pregnant.