I remember reading an interview with Chet Atkins about the album he made with Mark. Chet had never met Mark before the recording session and was expecting an obnoxious, full-of-himself, rock ( Chet had encountered many such "stars" over the years), but he was amazed to find that Mark was charming, repectful and a joy to work with.
I love Mark's playing but this story makes me love Mark the man.