Some of the series I follow intensely have showrunners I know off the top of my head. Doctor Who has Stephen Moffat (who was preceded by RTD). Lost had Carlton Cuse and Damon Lindelof. But I only know they are the showrunners due to media on the internet referring to them as such. Watching the shows, there's no 'showrunner' credit, or obvious marking that these people ran the show during that season/episode.
Is there some standard way to determine who the showrunner(s) of a show is/are?