claim: Rob McElhenney is on an FX/FXX comedy series playing a character.
evidence: Robert Dale `` Rob '' McElhenney -LRB- born April 14 , 1977 -RRB- is an American actor , director , producer , and screenwriter .. He is best known for playing Mac on the FX / FXX comedy series It 's Always Sunny in Philadelphia .. Philadelphia. Philadelphia. Mac. Mac ( It's Always Sunny in Philadelphia ). FX Networks. FXX. FXX. He is also one of the developers , executive producers , and the creator of the show , which has provided him with writing and directing credits on various episodes .