 He was involved in wreck surveys both inside and outside NPS jurisdiction, including the first NPS surveys off Point Reyes National Seashore, Channel Islands National Park, and Cape Cod National Seashore, Pearl Harbor, where he studied the USS Arizona and , and at Bikini Atoll in the Pacific, where he worked with the team on the atomic-bombed ships of Operation Crossroads, the world's first nuclear tests (1946).He was principal author of the final National Park Service study on the Bikini Atoll wrecks.Those shipwrecks include the aircraft carrier USS Saratoga, Japanese battleship Nagato, the battleship USS Arkansas, the destroyer USS Lamson, the attack transport USS Gilliam, the attack transport USS Carlisle, and the submarines USS Pilotfish and USS Apogon.