Interorganizational relationships, the design and management of marketing channel systems, valuation of marketing relationships as assets, and marketing strategy. He has published in the Journal of Marketing Research, Journal of Interactive Marketing, Psychology & Marketing, Journal of Direct Marketing, Business Strategy Review, Encyclopedia Britannica, and numerous conference proceedings. He has also authored a number of teaching cases that are used at universities around the world and has presented his research at national and international forums, where he has won several best paper awards.
