Portia McGrew has been named adminstrative director of the Washington Design Center. McGrew was formerly public relations director with the Pacific Design Center in Los Angeles.

Paul A. Lepeonka and Steven P. Noble have joined the Louis C. Grossberg Co., an accounting firm in Chevy Chase.

Eason Cross Jr. has been named president of the Northern Virginia chapter of the American Institute of Architects. He is a partner in the Arlington firm of Cross & Adreon, AIA. Thomas L. Kerns, a principal with Kerns Group Architects in Washington, was named president-elect.

Dr. Stephen C. Hopkins Jr. was elected vice president of the Middle Atlantic Society of Orthodontists. He is in private practice in Washington.

Phillip W. Taff has been appointed chief financial officer of the PHH Group Inc. Duncan H. Cocroft was appointed treasurer and succeeds Taff.

William M. Gibson has been appointed executive vice president and chief operating officer of STSC Inc. in Rockville. He was formerly vice president for marketing with Strategic Information, a subsidiary of the Ziff-Davis Publishing Co.

David R. Millard has joined Ellerbe Associates Inc. as manager of the interior design division. He was formerly with the Washington office of Skidmore, Owings and Merrill.