Mr. Patrick has long been a leader in the field of agents of bioterrorism, serving as chief of Product Development Divison at the Biological Warfare Laboratories, where products included bacteria, viruses, fungi, rickettsiase and toxins. He also worked in virus production, field testing of munitions systems, and as Plans and Programs Officer for USAMRIID, among other positions.

More recently, he has worked with DIA, AFMIC, CIA, USAMRIID, FBI, Secret Service and other institutions, providing lectures on biological agents, biodefense, biosafety and more. His experience has been instrumental in understanding Iraq's bioogical warfare program. Since his retirement he has continued to produce reports and papers for these organizations and others on a wide variety of bioterrorist agents. Much of his work is described in the recently published boo Germs: Biological Weapons and America's Secret War.