He was also the Curator of Photography for the Middendorf Gallery in Washington District of Columbia He has edited and published several publications on art and photography, including Manitoba Ray"s Paris Portraits: 1921-1939, William Christenberry: West/P, and Joseph Mills: Inner City.
Hemphill is a founding member of the board of directors for the District of Columbia Arts Center, as well as a founding member of the board of directors of FotoWeek District of Columbia. He served as vice-chair on the board of the Washington Project for the Arts and is a member of the Board of Directors for The Association of International Photography Art Dealers.
