Integrated Electrical Services, Inc. (Houston): Richard Nix will step aside as group V.P., IES Residential and assume an operational role in that segment's East Coast region, effective July 1. Dwayne Collier, currently IES' V.P. of operations, Single-family Divisions, will succeed Nix and assume the position of group V.P., IES Residential on July 1. Collier has been at IES for almost 20 years, serving in various management positions in the residential business. He will also continue to lead the company's single-family operations.