John M. Clark, a food, fruit and vegetable marketing specialist for the U.S. Agriculture Department for more than 20 years, died Jan. 31 at Asbury Methodist Village in Gaithersburg, Md. He was 69.

He had pneumonia and complications related to a stroke he suffered in 1994, his wife said.

Mr. Clark worked for the Agriculture Department’s regional office in Chicago for about a decade before moving to Washington in 1981. He continued working as a marketing specialist until his retirement in 1995.

John Martin Clark was a native of Youngstown, Ohio. He was a 1966 graduate of the old St. Joseph’s College in East Chicago, Ind., and received a master’s degree in history in 1972 from Purdue University in West Lafayette, Ind. He later received a master’s degree in library and information science from the University of Maryland in 1991.

He was an Army veteran of the Vietnam War.

His memberships included the Society for Creative Anachronism, a nonprofit living history group dedicated to studying the Middle Ages and the Renaissance.

His first marriage, to Jean Kiriades, ended in divorce.

Survivors include his wife of 31 years, Leslie Hubbell of Germantown, Md.; a son from his first marriage, Michael Clark of Round Lake, Ill.; and three grandchildren.

— Megan McDonough