Putnam, David: - During his career in law enforcement, best-selling author David Putnam has worked in narcotics, violent crimes, criminal intelligence, hostage rescue, SWAT, and internal affairs, to name just a few. He is the recipient of many awards and commendations for heroism. He has three book series: The Bruno Johnson series, The Dave Beckett series, and the Imogene Taylor series. The Obsessions of Harvey Usher is a standalone.