Mark S. Jimerson, 59, a Russian language specialist and retired FBI special agent, died Nov. 22 at his home in Mitchellville.

He had brain cancer, said his wife, Wendy Jimerson.

Mr. Jimerson joined the FBI as a special agent in 1985. He worked in FBI offices in Tampa and San Francisco before he was transferred to the FBI’s Washington headquarters in 1995. He helped establish the first FBI office in Moscow and managed foreign counterintelligence investigations.

From 1997 to 2000, he served as the assistant legal attaché to the U.S. Embassy in Tallinn, Estonia, and helped coordinate criminal investigations in the Baltic region. In 2000, he was made the legal attaché to Ukraine.

He returned to Washington in 2002 to serve as the FBI liaison to the Justice Department’s Office of International Affairs. Three years later, he was promoted to unit chief of the FBI’s International Operations Division. He returned to the Office of International Affairs in 2006 and was chief of the office’s Eurasia unit when he retired in 2008.

Mark Stephen Jimerson was born in Madison, Ill. After studying Russian at the Defense Language Institute in Monterey, Calif., he joined the Army as a Russian linguist and was on active duty from 1973 to 1977. He received a bachelor’s degree in Russian studies at the Monterey Institute of International Studies, a graduate school of Monterey’s Middlebury College, in 1981.

His memberships included the Largo Community Church in Mitchellville, where he was past director of the drama ministry and served on the church board.

Survivors include his wife of 34 years, Wendy Gaiter Jimerson of Mitchellville; two children, Stephania Mahdi of Mitchellville and Mark Jimerson of Adelphi; his mother, Louise Jimerson of Madison; one brother; two sisters; three half-brothers; and a granddaughter.

Megan McDonough