Greg La Brache has been appointed director of public affairs of the Northrop Corp. He was formerly a public relations coordinator of Mobil Oil Corp.

James E. Lunson Jr. has been elected vice president of the Tiber Construction Co. Lawrence A. Duke has been named corporate secretary.

Dennis I. Meyer has been named to the board of directors of the Oakwood Homes Corp. Meyer is a partner in the law firm of Baker & McKenzie.

Ronald W. Anderson has been named director of product and development engineering of Tate Architectural Products in Jessup, Md. He was formerly with the Chrysler Corp.

John D. Cooper has been promoted to vice president of operations of Precision Methods Inc. in Lorton, a company that repairs and maintains computer systems. Cooper was formerly director of field services.

Frank C. Thompson has been appointed vice president and general manager of Professional Lithography Inc..

Peter B. Pakradooni has been named a vice president of Packard Press. He was formerly vice president of International Printing Co. in Philadelphia.

Samuel V. Goekjian has been named chairman and chief executive officer of Consolidated Westway Group Inc. in Englewood Cliffs, N.J. Goekjian is a senior partner in the Washington law firm of Surrey & Morse.