Obituaries of residents from the District, Maryland and Northern Virginia.

Melvin Segal, Public Health officer

Melvin Segal, 70, a licensed social worker who spent 35 years as an officer in the U.S. Public Health Service before retiring in 2004, died May 25 at a hospital in Olney. The cause was complications from a fall at his home in Silver Spring, said his ex-wife, Vivian Chen.

Capt. Segal, a Boston native, helped finance drug-treatment programs at the national and state level and directed one of the first government studies on the economic cost of drug and alcohol abuse. Among other USPHS jobs, he was a senior public-health adviser and director of programs for the Center for Substance Abuse Prevention. After his federal retirement, he was a health-care consultant for Support Services International.

Hugh E. Witt, defense contracting executive

Hugh E. Witt, 92, a vice president and government liaison for the defense contractor United Technologies from the late 1970s until 1987, died May 18 at an assisted-living center in Fredericksburg, Va. The cause was cancer, said a nephew, Hugh Lowry.

Mr. Witt, a former Arlington resident, was born in Winchester, Ky. He worked in logistics and procurement for the Air Force and Navy departments early in his career. He was principal deputy assistant secretary of defense in the mid-1970s and was administrator of the Office of Management and Budget’s new Office of Federal Procurement Policy. He was a past chairman of the Council of Defense and Space Industry Associations and a past member of Alexandria’s Board of Architectural Review.

James S. Powers, obstetrician and gynecologist

James S. Powers, 68, an obstetrician and gynecologist who had been on the staff of Sibley Memorial Hospital in Washington since 1977 and delivered almost 2,500 babies during his career, died May 20 after collapsing near the Capital Crescent Trail in Bethesda. The cause was a heart attack, said his wife, Joan Draper Powers.

Dr. Powers, a Bethesda resident, was native of Brevard, N.C. He was a trustee of the Sibley hospital foundation, a past president of the medical staff and a past vice chairman of the OBGYN department. He also had a medical practice in Chevy Chase since the 1980s, much of the time in partnership with Dr. Francis T. Bergin. He was a member of Congressional Country Club in Bethesda.

Regina Dowling, NIH nurse

Regina Dowling, 83, who spent 26 years as a nurse at the National Institutes of Health in the field of apheresis, the process of collecting platelets used for blood transfusions to people with cancer and other illnesses, died May 20 at a hospital in Baltimore. She was run over by a horse during a wedding ceremony, said a granddaughter, Kimberly Tavenner.

Mrs. Dowling was born Regina Ferguson in Cumberland, Md., and she spent her early career as a nurse at Cumberland Memorial Hospital. She later joined the NIH Clinical Center, whose apheresis clinic was named in her honor after her retirement in 1990. She volunteered at the Mercy Health Clinic and was a member of Trinity United Methodist Church, both in Germantown, Md. She moving last year to Hanover, Md., from Germantown.

Robert W. Doyle, antitrust lawyer

Robert W. Doyle, 66, a former Federal Trade Commission official and antitrust lawyer who was a founding partner in 2006 of the law firm Doyle, Barlow and Mazard in Washington, died May 18 at a hospital in New London, Conn. The cause was a heart attack, said a daughter, Michaela Doyle.

Mr. Doyle, a Washington resident, was a Philadelphia native. He spent more than 20 years at the FTC, rising to deputy assistant director of the Bureau of Competition before leaving the agency in 1998. He then was a partner at several law firms, including Arent Fox, before starting his private practice. His expertise in antitrust law extended to matters affecting industries including telecommunications, insurance, supermarkets and health care. He was an advisory board member of the American Antitrust Institute and a co-chair of the Temple University law school alumni club of Washington.

Philip H. Highfill Jr., GWU professor

Philip H. Highfill Jr., 95, who retired from George Washington University in 1989 as a professor of English literature, died May 17 at his home in Bethesda. The cause was pneumonia, said a son, Philip H. Highfill III.

Dr. Highfill was born in Petersburg, Va. He was an assistant professor at the University of Rochester before joining the GWU faculty in 1955. He was an author and editor of “A Biographical Dictionary of Actors, Actresses, Musicians, Dancers, Managers and Other Stage Personnel in London, 1660-1800,” an award-winning 16-volume work that began appearing in 1973 and has become a standard reference in theater history studies. He was a consultant in literature at the Folger Shakespeare Library from 1965 to 1968 and was a past president of the Cosmos Club and the Literary Society of Washington.

Lois Reinemer, church member

Lois Reinemer, 94, a onetime nurse who settled in the Washington area in 1956 and was a member of Friendship United Methodist Church in Fairfax County, died May 11 at an assisted-living center in Denver. The cause was congestive heart failure, said a son, Michael Reinemer.

Mrs. Reinemer was born Lois Grindy in Lewistown, Mont., and she served in the Army Nurse Corps during World War II. She moved in 1989 from Falls Church to Helena, Mont., and more recently lived in Denver.

John H. Moore, chief petty officer

John H. Moore, 92, an electronics and communications systems specialist for the Navy on active duty from 1941 to 1961 and then another decade in the Fleet Reserve, died May 17 at a hospital in Fairfax County. The cause was pneumonia, said a son, John H. Moore Jr.

Mr. Moore, a Falls Church resident, grew up in Roanoke, Ala. He served in the Civilian Conservation Corps during the Depression, helping build the Appalachian Trail. During World War II, he participated in the invasion of the Philippines, his family said. His final active-duty assignment, at the rank of chief petty officer, was supervisor of communications with the office of the Chief of Naval Operations at the Pentagon. He was a member of Knox Presbyterian Church in Falls Church.

— From staff reports