He has been a photojournalist, working for the United Nations and Camera Press and traveling world-wide, especially in Asia and Africa. His photos have been included in 21 books (Pennsylvania’s Tapestry: Scenes from the Air; Pennsylvania’s Natural Beauty; Amish Ways; etc., and the series Pennsylvania’s Natural and Cultural Heritage). The volumes were published in part by RB Books, a company established by Seitz and his wife. As well, many magazines have featured his photos (Time, Newsweek, National Geographic Traveler, The Guardian, etc.) His stock file contains over 60,000 photographs. He was awarded a fellowship grant from the Pennsylvania Council of Arts and a silver medal in New York’s International Film and Television Festival. His photos have also been exhibited at the World Exhibition of Photography and New York’s Museum of Natural History.