Several key management changes at the J. Walter Thompson USA Inc. office in Washington were announced recently. The personnel changes resulted from the incorporation of JWT's Brouillard Communications division into J. Walter Thompson USA here.

Senior vice president and general manager Jim Willette has moved to Los Angeles to join JWT Group Inc.'s worldwide advertising division. Peter Gridley, previously management supervisor on the USAir account, has been named to succeed Willette as senior vice president and general manager here. Drew Babb, vice president, and previously creative director for Brouillard Communications, has expanded his responsibilities to become creative director for JWT/Washington.

Senior vice president Douglas Bibby, former general manager of Brouillard, has been appointed account group director for the Marine Corps, the National Association of Home Builders, Norfolk & Western Railways and the Planning Research Corp. accounts.

Debra Fisher has been named media director for JWT/Washington. In this position she will oversee media planning activities on all JWT/Washington accounts. Other appointments at JWT/Washington include Peter Hanley as senior vice president and Stephen Smith as management supervisor.

Former Brouillard director of public relations David A. Narsavage, meanwhile, has joined the Washington office of Hill & Knowlton Inc. as director of editorial services. JWT bought Hill & Knowlton earlier this year for $28 million.

The J. Walter Thompson Co. renamed its corporate communications division Brouillard Communications in September 1980. The firm specialized in image and advocacy advertising and corporate communications for associations and corporations rather than product advertising. Merger of the firm's operations here with the parent company does not affect Brouillard operations in New York and Pittsburgh.