For over two decades, John has covered the world of politics, traveled internationally, and worked as a commercial and editorial photographer. Harrington's work has appeared in The Washington Post, USA Today, Time, Life, Newsweek, The National Geographic Society, and Rolling Stone, among many others.
John has produced three commissioned books for the Smithsonian and the second edition of his book Best Business Practices for Photographers, remains a best-seller.
John has lectured across the United States to events for the American Society of Media Photographers, Advertising Photographers of America, Professional Photographers of America, and the National Press Photographers Association. John currently serves as a National Director on the board of the American Society of Media Photographers, and he concluded serving his second term as the President of the White House News Photographers Association in May of 2011.
A 2007 recipient of the United Nations' Leadership Award in the field of photography, John also received the NPPA's Morris Berman Citation in 2007 for special contributions advancing the interests of photojournalism, and in 2013 John received the J. Winton Lemen Fellowship Award for continuing outstanding service in the interests of press photography and for outstanding technical achievement in photography.