Darius is director of a renowned fine-art photography gallery. He has been involved with photography and art book publishing his entire adult life. He was founding editor of photo-eye Booklist, a quarterly magazine devoted to photography books, which ran from 2002–2007. A lecturer and writer, he has contributed to Aperture, Blind Spot, Bookforum, BOMB, PDN, and American Photo. In 2008, he was named by Photo District News as one of the fifteen most influential people in photography book publishing. His most recent title, Publish Your Photography Book, co-authored with Mary Virginia Swanson, was released by Princeton Architectural Press in the Spring of 2011. An updated 2nd edition will be published in the Spring of 2014.