Actor · DirectorJohn Allen NelsonAugust 28, 1959(64 years old)San Antonio, Texas, USAJohn Allen Nelson (born August 28, 1959) is an American actor.SocialsIMDbKnown forFriendsPaulKiller Klowns from Outer SpaceDave HansonGrey's AnatomyArthur Soltanoff24Walt CummingsCriminal MindsDan MurphyNCISLloyd ManditskyCastleWalter DennisCSI: Crime Scene InvestigationRoger GentryBurn NoticeLesherCSI: MiamiMike RydellWithout a TraceMark DuncanMatlock