Environmental Management and Manufacturing Performance: The Role of Collaboration in the Supply Chain Stephan Vachon School of Business and Center for the Environment Clarkson University P.O. Box 5790 Potsdam, New York, 13699-5790 315-268-3980 Fax: 315-268-3810 svachon@clarkson.edu Robert D. Klassen Richard Ivey School of Business The University of Western Ontario London, Ontario, N6A 3K7 519-661-3336 rklassen@ivey.uwo.ca April 15, 2005 under first review by Journal of Operations Management Keywords: Environmental Management, Supply Chain Management