Scuba diving since the early 80's, Mathis became a Master Instructor at Texas State University. He taught hundreds of students how to dive and also taught underwater photography at the university. After graduating from Texas State, Mathis moved to the Western Caribbean where he worked as Photo Pro at Anthony's Key Resort in Roatan, Honduras. There he operated a photo shop - teaching underwater photo classes, renting cameras, running lab services, and providing custom video services. Mathis' photos have been published in books, magazines, newpapers, advertisements, product catalogs, and web sites. Mathis and wife Shannon are very active with their local dive club and enjoy dive trips and teaching underwater video classes together. When not diving, they enjoy weekend outdoor adventures every chance they get.