Hornsby plays defrocked priest Matthew "Rickety Cricket" Mara on the FX comedy It's Always Sunny in Philadelphia, also serving as an executive producer and writer on the show.
He was portrayed by actor David Hornsby in the 2006 film Flags of Our Fathers.
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Unsupervised was created by David Hornsby, Scott Marder, and Rob Rosell, who also serve as executive producers alongside Adam Reed, Matt Thompson, Rob McElhenney, Glenn Howerton, and Charlie Day and the production companies, Floyd County Productions, RCG Productions, and FX Productions.