Priscilla Jencks Schuhmann

Agriculture Department Chemist

Priscilla Jencks Schuhmann, 83, a retired chemist with the Agriculture Department who analyzed breakfast cereals and other groceries for sugar content, died of kidney disease May 16 at Bryon House in Potomac.

Mrs. Schuhmann was born in Port Arthur, Tex., but her roots were in New England, where her ancestors were early settlers. Her father was an engineer and was working on a project in Texas at the time of her birth. She spent most of her childhood in Littleton, N.H., and graduated with a bachelor's degree in chemistry from Smith College in Massachusetts in 1943.

She then moved to Washington to work as an analytical chemist at the Bureau of Standards, now the National Institute for Standards and Technology. She married in 1946 and left the bureau to raise her family.

Mrs. Schuhmann returned to work in the mid-1960s, when she took a position in the chemistry department of the University of Maryland. There she worked with Dr. Cyril Ponnamperuma, a noted authority on the chemical origins of life, in the Laboratory of Chemical Evolution. They studied the formation of biological building blocks from the interaction of electrical arcs with the gases thought to have existed in the primordial atmosphere.

She worked briefly at Goddard Space Flight Center in Greenbelt in the mid-1970s. She concluded her career as a chemist at the Department of Agriculture in Beltsville, retiring in 1987.

Mrs. Schuhmann lived in Adams Morgan for about five years before moving to Bethesda in 1951. In 2004, she and her husband moved to Potomac.

Her husband of 58 years, Shuford Schuhmann, also a chemist, died in 2004.

Survivors include three children, Dr. Deborah J. Schumann and Jeremy S. Schuhmann, both of Bethesda, and Dr. Reinhardt B. Schuhmann of Brookhaven, N.Y.; two sisters; and three grandchildren.

Stanley Ernest Sokol

Lockheed Martin Official

Stanley Ernest Sokol, 65, a retired Navy commander who specialized in engineering work on weapons systems and since 1984 had been an international program manager for Lockheed Martin, died May 27 at a hospital in Philadelphia. He had a cerebellar hemorrhage.

Cmdr. Sokol, a Bowie resident, was on a business trip when he died. At Lockheed Martin, he handled defense sales contracts for vertical launch systems and programs.

He was a Cleveland native and a 1962 history graduate of Syracuse University, where he played football and was a member of the 1959 national championship team.

He was in the Navy from 1962 to 1984, during which time he served in the Vietnam War. During his military career, he also received a master's degree in electrical engineering from the Naval Post Graduate School in Monterey, Calif.; studied Vietnamese at the Defense Language Institute in Monterey; and received a master's degree in business administration from Boston University.

He settled in the Washington area in 1981, and his final active-duty assignment was at Naval Sea Systems Command in Crystal City.

After his military retirement, he received a master's degree in American studies from the University of Maryland and was working on his doctorate in business from Capella University, a Web-based education provider.

He was a member of St. Edward the Confessor Catholic Church in Bowie and Knights of Columbus.

Survivors include his wife of 41 years, Marianne Simko Sokol of Bowie; two daughters, Susan Dennin of Salt Lake City and Karen Williams of Cincinnati; a brother; and six grandchildren.

Edward W. Hummers

Banker, Volunteer

Edward W. Hummers, 98, whose banking career began when he was a teenager and continued for more than four decades, died May 27 of congestive heart failure at Manor Care Potomac.

Mr. Hummers was born in the Bronx, N.Y. He quit school in the eighth grade, and five years later, as a 19-year-old, went to work as a messenger for a bank that was eventually acquired by Chase Manhattan Bank. He stayed with Chase Manhattan for 43 years, retiring in 1969 as a vice president.

He lived the greater part of his life in northern New Jersey, moving to Potomac in 1993. He was active in the Friends Club, an organization providing day care to men with Alzheimer's disease at Bradley Hills Presbyterian Church in Bethesda and at the Friends Meeting House in the District. In 1997, Maryland Gov. Parris N. Glendening named him one of Maryland's "Most Beautiful People" in honor of his volunteer work.

His wife, Cecelia Hummers, died in 1993. A daughter, Lois Beattie, died in 1972.

Survivors include a son, Edward W. Hummers of Potomac; a sister; six grandchildren; and 10 great-grandchildren.

Stuart M. Quigg

Arms Export Expert

Stuart M. Quigg, 72, a former Army officer who later operated a consulting business on international regulations concerning the sale of arms and technology, died May 9 of cancer at Virginia Hospital Center. He lived in Falls Church.

After joining the Army in 1958, Col. Quigg was trained as a Latin American specialist and became an intelligence officer. He was the principal intelligence staff officer with the 1st Infantry Division in Vietnam in 1970-71 and was a senior intelligence analyst at U.S. Army headquarters in Saigon. He also was a liaison officer to the U.S. delegation at the Paris peace talks of 1972 and 1973.

From 1975 until his retirement in 1980, Col. Quigg was assigned to the State Department's Bureau of Inter-American Affairs, where he analyzed the sale of military equipment throughout the Americas. He also served as a liaison to the Organization of American States, foreign embassies, federal agencies and academic institutions.

As president of Q International Group in McLean from 1980 until his death, Col. Quigg consulted with leading defense contractors as an authority on U.S. export control laws concerning arms and technology. He appeared as an expert witness in court cases involving the sale of arms.

Col. Quigg was born and raised in New York and graduated from Fordham University in the Bronx, N.Y. He did graduate work at Columbia University and the University of Utah and received a master's degree from the University of Oklahoma in 1966. He did graduate work at the University of the Americas in Mexico City. He was fluent in Spanish.

He had an extensive knowledge of the history of the American frontier and of Central and South American art and archaeology. He often went on hiking and canoeing trips north of the Arctic Circle, and in his late sixties he survived for at least 30 minutes in 45-degree water after being thrown into a river by a wave.

He collected and restored muzzle-loading rifles and was a skilled landscape photographer. He also spent three decades restoring a 19th-century inn in Alexandria, N.H.

Survivors include his companion, Pamela Fitzgerald of Fairfax City.

Sylvester Dean

Navy Employee, Musician

Sylvester Dean, 72, an employee of the Navy Department who also was a gospel pianist, died May 14 of liver failure at Veterans Affairs Medical Center in Washington.

Mr. Dean, who was born in Abington, Pa., had lived in the District since 1951. He served in the Army in Germany from 1953 to 1955.

From 1955 to 1958, he went on tour throughout the United States and around the world as the pianist for renowned gospel singer Clara Ward and the Clara Ward Singers. He also was an accompanist for gospel singer Marion Williams.

In the late 1950s, Mr. Dean joined the Navy Department as a civilian worker, first as a clerk-typist and later in a variety of supervisory positions. He retired in 1986.

Later, he volunteered at the D.C. Department of Motor Vehicles and for various senior citizen programs. He continued to play piano and organ for several Washington churches, particularly for Mount Bethel Baptist Church.

Mr. Dean enjoyed international travel and visited Asia, Greece, Turkey, the Caribbean and several countries in South America.

His marriage to Myrna L. Lee ended in divorce.

Survivors include his daughter, Stephanie Lynn Dean of Wareham, Mass.; a brother; four grandchildren; and two great-grandchildren.