Most of his work deals with the relationships between humans and animals, and humans and nature. Gaston has worked on six continents, including a residency in Antarctica. His photos and articles have appeared in numerous publications in North America and Europe, and is the recipient of multiple international photography prizes. His photos have been shown in galleries and museums in Europe, South America and North America, including at the Smithsonian Institute. He regularly lectures on photography, and on his projects, around the world. Gaston is also the Communications Coordinator for the International League of Conservation Photographers (www.ilcp.com), where he helps coordinate conservation expeditions with some of the world's top photographers.