Marvin Lasser, 86, a retired chief scientist of the Army whose work included the development of stealth technology, including stealth aircraft, died Dec. 20 at Suburban Hospital in Bethesda after a heart attack. He was a Potomac resident.

His son Bob Lasser confirmed his death.

Dr. Lasser was director of research for Philco Corp. in Philadelphia before being appointed chief scientist and director of Army research in 1966. This job included responsibility for a billion-dollar budget and supervision of 37 Army laboratories. He was among scientific pioneers in programs ranging from the development of infrared cameras to the training of dogs to sit as sentinels near land mines until the mines could be deactivated.

On retiring from federal service in 1983, Dr. Lasser and his son Bob formed Imperium Inc., a Beltsville-based company where he developed an ultrasound camera for medical and industrial use.

Marvin Elliot Lasser was born in Brooklyn. He served in the Army in the Philippines during World War II and graduated from Brooklyn College in 1949. In 1954 he received a doctorate in physics at Syracuse University.

He was a fellow of the American Physics Society.

Survivors include his wife of 58 years, Jane Shapiro Lasser of Potomac; two sons, Bob Lasser of Washington and Mike Lasser of Columbia; and five grandchildren.

— Bart Barnes