1. Professor emeritus of biostatistics, Carolinas HealthCare System, Charlotte, NC. He has been an expert witness or consultant in eight legal cases, including six that involved forensic evidence
2. Statistician at Dickson Advanced Analytics, Carolinas HealthCare System, Charlotte, NC. He also practised law for over 10 years, specialising in cases involving medical and scientific issues
3. Senior research biostatistician at Henry Ford Hospital, Detroit, Michigan