Dr. Cook is a Divers Alert Network (DAN) Instructor with multiple certifications in diving accident management. In addition he has been a DAN referral physician for more than the last 15 years. His certifications also include that of a NOAA diving medical officer. Cook is a contributing author for the medical textbook Expedition Medicine to which he contributed chapters on dive medicine and hazardous marine life. He is currently the Medical Editor for Sport Diver Magazine.

In 2008 and 2009 he was the diving medical officer for two NOAA expeditions to research and document German U-boats that were lost off the North Carolina Coast during the World War II Battle of the Atlantic. He has also been the Diving Medical Officer (DMO) on several scientific expeditions for reef surveys in the central pacific with the New England Aquarium, Woods Hole and Scripts Oceanographic Institutes. He was involved with NOAA and the U. S. Navy as the DMO on the Monitor Expedition in 2003 during which the turret was raised. Dr. Cook has also served as a consultant to NOAA for search and rescue procedures in diving operations and is one of the contributing authors to the NOAA Diving Manual. He is an award-winning underwater photographer whose photographs have been published in multiple magazines, books and calendars. Besides, diving Dr. Cook is a competitive cyclist and triathlete and has competed in the Hawaiian Ironman competition. He resides with his wife, in Severna Park, Maryland.