Greg's photos regularly appear in magazines and websites such as National Geographic Traveler, AAA VIA, Travel Oregon and Alaska Airlines. He has worked with several calendar and book publishing companies and he is the sole or principal photographer for several books in the Compass American Guides series of travel handbooks. His stock photography is distributed worldwide through agents Getty Images, Alamy, and Corbis.

Greg is a member of the American Society of Media Photographers (ASMP), the North American Nature Photography Association (NANPA), the Society of American Travel Writers (SATW), and the North American Travel Journalists Association (NATJA). His photography has won several awards, and he has received multiple honors from the Society of American Travel Writers and for his guidebooks Photographing Oregon and Photographing Washington.