Robert Jackson Williams, 68, a former research scientist at the Naval Research Center in Bethesda, died Oct. 17 at Suburban Hospital of lung cancer. He lived in Bethesda.

Dr. Williams, who studied the effects of freezing injured cells of plants, human organs and mollusks, was at the research center in the 1960s and the 1990s. He retired in 1998 but worked there as a volunteer until his death.

From the late 1960s to the 1980s, Dr. Williams was a research scientist the American Red Cross's blood research lab in Montgomery County.

Dr. Williams was born in Iowa City and grew up in Madison, Wis. He received a bachelor's degree in zoology and master's degree in ornithology from the University of Wisconsin in the 1950s. He received a doctorate in zoology from the University of Maryland in 1968.

Dr. Williams served in the Army Signal Corps from 1953 to 1955 and retired from the reserve as a first lieutenant in 1962.

He was a member of the Southern Maryland Boating Association and the Rockville Power Squadron, a boating club for which he also edited the newsletter.

Dr. Williams sang in the 1970s with Washington National Cathedral Choral Society.

His marriage to Nina Stromgren Allen ended in divorce.

His second wife, Craigeene A. Williams, died in 1998.

Survivors include a son from his first marriage, Erik Williams of Havertown, Pa.; a daughter from his first marriage, Harriet Hopf of San Francisco; a daughter from his second marriage, Kelsey Ballantine of Los Angeles; a brother; and three grandchildren.