W. R. Grace & Co. has announced several changes to its leadership team. Richard C. Brown has been elected a vice president of Grace and has been named president of Grace Performance Chemicals. Brown succeeds Robert J. Bettacchi, who recently announced that he was stepping down as president of Grace Performance Chemicals. Brown joins Grace following a 19-year career at General Electric Co., where he last served as president of GE Silicones - Core Products. Additionally, Mark A. Shelnitz has been elected vice president and general counsel of Grace; he will also continue as corporate secretary of the company.