A Ph.D is a research and teaching degree. Petersohn previously taught business management and statistics and has written on computer topics. He personally had to undergo serious cardiac surgery and a stressful recovery and that involved Johns Hopkins and the Med-Star Hospital in DC. He also had to deal with more than two dozen family medical issues that pushed him into working with London’s National Health System and Venice’s Mesre as well as the Cleveland Clinic in Cleveland and St. Joseph’s in Phoenix. He was drawn into extensive medical research as family issues became serious which spurred a deep interest in researching medical journals and reports from sources such as NIH, Johns Hopkins, UCLA, Emory University, and the MAYO Clinic.