Dr. Harrison is a lifetime aquatic sports competitor with an avid interest in ocean sports and related equipment including surfboard, sailboard, SCUBA, kitesurfing, and snowboard inventions and designs.  He is very familiar with firearms technology, is a licensed shooting instructor, and was a successful marksmanship competitor with prior U.S. military service.  He has been deposed and cross-examined as a technical expert, and has also taken depositions of technical experts as a lawyer.