Mones Edgar Hawley, 80, an electrical engineer whose wide-ranging scientific career included work in the fields of radar, noise reduction and alternative fuels, died of respiratory failure June 5 at the Veterans Affairs Medical Center in Washington. He lived in the District.

Mr. Hawley worked as a scientist for almost 60 years. He began his career in 1946 at Stromberg-Carlson, an early manufacturer of radios. From 1948 to 1962, he worked at RCA as an electrical engineer specializing in acoustics, rising to the position of manager of operations research.

He moved to Washington in 1962 as director of research for the East Coast office of Planning Research, a major defense contractor of the time. He was instrumental in developing radar equipment and in other classified projects. He was based in London for Planning Research from 1969 to 1973, when he moved to Los Angeles to work for Professional Services International Inc.

He returned to Washington in 1977 as executive vice president of Jack Faucett Associates, a Bethesda consulting firm. Mr. Hawley's work included research in such disparate fields as alternative fuels for transit buses, magnetic levitation for trains, automated transportation, the measurement of noise from ships and aircraft and airlines' anti-drug programs for employees. He maintained his position until his death.

He was a specialist in speech communication systems, particularly in ships, airplanes and other modes of transportation. In the 1970s, he published two scientific books, one on coal and the other on the acoustics and intelligibility of speech patterns.

Mr. Hawley was born in Casper, Wyo., and moved frequently as a child. He graduated from high school in Warren, Pa. During World War II, he joined the Army Air Forces and served as a navigator on a B-25 Mitchell bomber stationed in North Africa. His plane was shot down over Italy in 1944, and Mr. Hawley was held in a German prisoner-of-war camp on the Baltic Sea until the end of the war. He was awarded the Distinguished Flying Cross, the Purple Heart and the Air Medal.

In 1946, he received a bachelor's degree in mathematics and physics from the University of Rochester in New York; two years later, he received a master's degree in the same subjects from Rochester.

He was a fellow of the Acoustical Society of America, for which he served as editor of its professional journal. He was also a member of several engineering and computer societies and was a member emeritus of the National Academy of Sciences.

He had a broad range of cultural interests and supported such organizations as the Folger Shakespeare Library, the Folger Consort, art museums and the Octagon House, a museum of the American Institute of Architects.

Mr. Hawley's marriage to Natalie Ann Farone ended in divorce. A son, Matthew Hawley, died in 2003.

Survivors include his wife of 24 years, Eunice Ann Gold; four children from the first marriage, Nathan Hawley of Ann Arbor, Mich., Mark Hawley of Madison, Va., Nancy Hawley Cannon of New York and Monica Hawley Whitebread of McLean; and five grandchildren.