BRUNSWICK — Kenneth M. Smith, 89, died April 26 after an extended illness.

He was born in Wheeling, W.Va., on March 24, 1923, to Paul and Anna McGregor Smith and attended Wheeling public schools. As a boy, he was active in the Boy Scouts of America and achieved the rank of Eagle Scout.

During WWII, he served in the Army Air Corps as an instructor in the radio mechanics school. He graduated from Ohio Wesleyan University in 1947 with a bachelor’s degree in chemistry and went on to earn his masters and doctorate in physical chemistry from Ohio State University.

In 1955, Smith joined the DuPont Co. as a research chemist and transferred to the technical service division where his group provided technical assistance to the marketing division of the photo products and electronics products departments.

Smith retired as a senior technical associate after more than 40 years. He spent many years as the chairman of the industry-wide American National and International Standards Committee for Photographic Chemicals, Photographic Processing and Imaging Systems. He also served on the standards committees studying the archival properties of photographic records and continued the standards work for a number of years following his retirement. Smith was a U.S. delegate to the International Standards Organization.

In 1976, he married Marjorie Eisenberger. Although their main home was in Newark, Del., they enjoyed many summers at their cottage in Pemaquid Harbor. In 2001 they moved to Brunswick and lived at the Thornton Oaks Retirement Community.

He was a member of the Central Presbyterian Church in Norristown, Pa., sang in the Barber Shop Quartet and the Deltones Barber Shop Chorus in Wilmington, Del., and was chairman of the Writers Group at Thornton Oaks. In retirement, he enjoyed traveling, writing, collecting stamps and spending time with his family.

He was predeceased by a brother, Harlan J. Smith, and his grandson, Whitney Smith.

Smith is survived by his wife of 36 years, Marjorie; sons Emory Smith and Jeffrey Smith and his wife, Diane DeBevec; daughter Carolyn S. Toth; step-daughter, Mary-Catharine Hartman and her husband, Matthew J. LaMourie; six grandchildren; and three great-grandchildren.

Services will be private. In lieu of flowers, memorial contributions may be made to the Natural Resources Council of Maine, 3 Wade Street, Augusta, ME 04330.