Douglas Best first began working as a field medical instructor in the US Army at Fort Sam Houston, Texas in 1980. He has worked as a nurse in such medical specialty areas as Pediatrics, Newborn Intensive Care, Home Health, adult cardiac, surgical and medical intensive care units, the emergency room, heart catheterisation, burn intensive care and the morgue. He has been a CPR instructor, EMT, Advanced Cardiac Life Support and Neonatal Advanced Life Support certified. He is also a curriculum specialist and has developed such workforce training programs as Medical Specialty Training for displaced workers, Medical Assistant, Certified Nursing Assistant in Spanish, and Medical Transcription for the University of Texas at Brownsville. He has also overseen research projects in the development of nurses from Mexico and Sri Lanka. He currently is a trainer working with Humana Military.