How to Be a Gentleman is an American sitcom television series that originally aired on CBS from September 29, 2011, to June 23, 2012. Lead actor David Hornsby created the series, adapting the nonfiction book of the same name by John Bridges.

David Alan Hornsby is an American actor. He is best known for a recurring role as defrocked priest Matthew "Rickety Cricket" Mara on the FX comedy series It's Always Sunny in Philadelphia, for which he also writes and co-produces. Hornsby also had a regular role on the NBC comedy-crime series Good Girls (2018–2020). He is also the voice of Fanboy in the Nickelodeon animated TV series Fanboy & Chum Chum.