The pursuit of underwater images has taken Gregory Sweeney to many remote locations including Tasmania, Mozambique, Papua New Guinea, Tonga, Ulithi, New Zealand, and the islands off British Columbia. He has received several international awards for his nature and underwater images. He has a degree in Wildlife Management and spent many years working as a Wildlife Biologist/Park Ranger for the National Park Service.

Gregory has spent much time with the manatees in their winter habitats in Florida. Over many seasons he has perfected the techniques of photographing these large and special marine mammals. His manatee photographs have been used to promote the protection of manatees. He also leads annual treks to photograph whales, dolphins, sharks, and the large mammals in Africa.

He believes in promoting a healthy attitude toward marine life through education and public awareness. Through his images and photo tours he hopes to encourage others to protect the oceans and their intrinsic beauty.