Stillings' career spans documentary, fine art and commercial photography projects. Changing Perspectives, his current project, is a multi-year aerial and ground-based photographic documentation of significant international renewable energy development. Stillings' work is in the collections of the US Library of Congress; Museum of Fine Arts, Houston; Los Angeles County Museum of Art; and the Nevada Museum of Art. Publications featuring his work include: The New York Times Magazine, National Geographic, Der Spiegel, Le Monde, Newsweek Japan, WIRED Italia. Stillings' latest book, The Evolution of Ivanpah Solar (Steidl 2015) won several awards including the International Photography Awards 2016 - Professional: Book Photographer of the Year.