Karl Logan is the guitarist of the heavy metal band Manowar. Karl joined Manowar in 1994, after local band gigs in Northeastern Pennsylvania with Arc Angel (which also featured a post-Twisted Sister A. J. Pero on drums for a while) and Fallen Angel featuring Ed Collins (POD).
Karl Logan relates in Hell on Earth Part I how he met Joey DeMaio by almost running him over with his motorcycle, which is how the two hit it off.