Sharon T. Nelson, 52, an administrative law judge with the D.C. Department of Consumer and Regulatory Affairs who also did private arbitration and mediation, died of cancer July 21 at home in Washington.

Judge Nelson served with the Department of Consumer and Regulatory Affairs from 1982 until 1995. Her work included civil fraud and violations of environmental regulations, license revocations and historic preservation cases. While serving in this capacity, she also had a private legal practice.

After leaving the D.C. government, she specialized in alternative dispute resolution. She was a private arbitrator and mediator for the American Arbitration Association, the National Association of Securities Dealers, the Library of Congress and other organizations. She also had written and lectured extensively in this field.

She was born in New York, graduated from the University of Southern California and its law school and received a master's degree in tax law from Georgetown University Law School.

In 1972 she moved to Washington and worked until 1979 as a special counsel with the Securities and Exchange Commission in the division of market regulation and later in the division of enforcement.

Her marriage to Howard Sheldon Abramson ended in divorce.

Survivors include a son, Nelson Louis Abramson of Washington; her parents, Shimon and Deniel Erem of Beverly Hills, Calif.; her companion, Jeffrey P. Altman of Washington; a brother; and a sister.