John M. Ryan, 89, a retired division chief for the Internal Revenue Service who later served as a labor mediator, died Feb. 27 at Shady Grove Adventist Hospital in Rockville.

He had complications from giant cell arteritis, a inflammatory condition affecting blood vessels, said his daughter, Jeanne Ryan Wolfson.

Mr. Ryan began working as an IRS revenue agent in Boston in the late 1940s. In 1968, he was named chief of the collections division in Albany, N.Y. He retired from the IRS in 1971.

A year later, he became a mediator for the New York State Public Employees Federation in Albany. He retired from that job in 1984.

Mr. Ryan moved to Leisure World in Silver Spring in 1997. He was a member of the comedy and ballroom dance clubs at Leisure World and of Our Lady of Grace Catholic Church in Silver Spring.

John McAleer Ryan was born in Lowell, Mass., and he grew up in Boston. He served in the Army’s information and historical service division during World War II.

Survivors include his wife of 58 years, Helen George Ryan of Silver Spring; a daughter, Jeanne Ryan Wolfson of Rockville; two brothers; two sisters; and two granddaughters.

— Matt Schudel