Ernest Romeo has been assigned manager of facilities engineering and maintenance for RRT Design & Construction Corp., Melville, N.Y.... Frederick R. Anderson has been named partner in the Washington, D.C., office of Cadwalader, Wicker sham & Taft.... Harris Waste Management Group Inc., Peachtree City, Ga., has named Dwight Walton Jr. regional manager.... The Waste Equipment Division of Associates Commercial Corp., Dallas, has appointed Jay Johnson regional salesman for the Midwest and Clarke Davis has been appointed regional salesman in the Southeast.... Roland Jensen, chairman and chief executive officer of NRG Energy Inc., Minneapolis, has retired.... Eder Associates Consulting Engineers, Locust Valley, N.Y., has appointed Christopher G. Creed as an associate/senior hydrogeologist.... Mack Trucks Inc., Allentown, Pa., has promoted Stan Janis to vice president of accounting and reports.... Connie Glover Ritzert of Aluminum Company of America, Pittsburgh, has been elected 1994 chairman of the ASTM Institute for Standards Research.... The National Recycling Coalition, Washington, D.C., has selected the following members to serve on its board of directors: Brenda Barger, Sherrie Gruder, Susan Hubbard, Don Kneass, Robert Langert, Eric Lombardi, Mark Loughmiller, Arley Owens, Brenda Platt, Jerry Powell, Caroline Rennie, Linda Stensland and Mary Tkach.... Also, Mark Lichtenstein has been elected president.... Jim Steinke has been promoted to vice president of Gundle Environmental Systems Inc., Houston.... Roux Associates Inc., Islandia, N.Y., has appointed Peter J. Gerbasi principal engineer.... Grundfos Pumps Corp., Clovis, Calif., has appointed the following people to become general managers: Cal Lawhorn, Western Regional Center; Jerry Christensen, Southcentral Regional Center; Dan Ellis, Midwestern Regional Center; and Mike Easterley, Southeastern Regional Center.... Michael D. Loy has been named president and chief operating officer at Skelly and Loy Inc., Harrisburg, Pa.... The Falls Church, Va., office of GBB Inc. has appointed Walter W. Davenport as a project manager.... Geraghty & Miller Inc., Denver, has promoted Cathleen M. Speak to national program manager for the company's RCRA services.