His research interests include intertemporal choice, consumer risk, and advertising/promotions effectiveness. His recent public policy related research examines cigarette warning labels, consumer processing of nutrition information, food supplement claims, and direct-to-consumer prescription drug advertising. His research has been published in various journals including Journal of Public Policy Marketing, American Journal of Public Health, Journal of Advertising, Journal of Interactive Marketing, Psychology and Marketing, Journal of Consumer Affairs, and Journal of Current Issues and Research in Advertising. Professor Kees has presented his research at numerous academic conferences around the world.