Ronald H. Zech has been appointed CEO of Chicago-based GATX, replacing James J. Glasser.... Harris Waste Management Group Inc., Peachtree City, Ga., has named Gary E. Guthrie the general manager of its Cordele, Ga., manufacturing facility.... Mack Truck Inc., Allentown, Pa., has promoted Russell A. Raine to vice president of customer product support.... Mark J. Sabol has joined East Manufacturing Corp., Ran-dolph, Ohio, as product manager for solid waste equipment.... Mack C. Gaston has been named vice president of leadership development-re-sources for Waste Management Inc., Oak Brook, Ill.... Rust Environment & Infrastructure, Greenville, S.C., a subsidiary of Rust International Inc., Birmingham, Ala., has appointed David S. Williams the East-Central region's business development manager, Woody Kawaters national air quality service line director and J.B. Holeman executive vice president of operations.... Wellman Packaging Products, Shrewsbury, N.J., has named Joseph C. Tucker head of its European PET resin business.... Kory Pace has joined Synthetic In-dustries, Chickamauga, Ga., as Central regional sales manager of geotextiles.... Raymond J. Ehrlich has been named project manager by GBB Solid Waste Management Con-sultants, Falls Church, Va.... SCS Engineers, Cincinnati, has named Robert J. Nowakowski senior project professional in the Walled Lake, Mich., office.... Eder Associates, Lo-cust Valley, N.Y., has made the following appointments: D. Robert Gan, project manager/senior project engineer, Jacksonville, Fla.; William J. Mikula, branch manager, Trenton, N.J.; and Roger C. Cooley, vice president and manager, Ann Arbor, Mich... Paul J. O'Conner has joined Roy F. Weston Inc., West Chester, Pa., as principal project manager for its New York metro region.... Allison Transmission, Indianapolis, has named David M. Piper chief engineer for commercial transmissions and Christopher E. Vargo manager of marketing.... Mike Muldoon has been appointed Northeast regional sales representative at Fluid Sy-stems, Aurora, Ill.... Browning-Ferris Industries Inc., Houston, has elected Bruce E. Ranck CEO, replacing William D. Ruckelshaw.... Paul L. Spence has been appointed by CH2M Hill, Corvalis, Ore., as manager of environmental services.

Horton Industries, Minneapolis, has named Nels Johnson executive vice presides, Alexandria, Va., has made the following elections: Mark Lictenstein, president; Susan Hubbard, vice president; Pat Smith, secretary; and Mick Barry, treasurer.... National Seal Co., Aurora, Ill., has appointed Mike Bowler vice president of its Asia/Pacific operations and Don DiGuilio Northeastern regional sales manager.... Paul L. Spence has joined CH2M Hill, Corvallis, Ore., as manager of environmental services.... Rock-Tenn Recycling, Dallas, has named Carlos A. Rovelo, market development director for the Southwest.... Volvo GM Heavy Truck Corp., Greensboro, N.C., has appointed Carl Nilsson component manager for its strategic and product planning department and Philip J. Romba senior public relations specialist.... Docushred Inc., West Kensington, Pa., has appointed Jane C. LaBonte senior account manager.