Professor Zettelmeyer specializes in evaluating the effects of information technology and big data on firms. More generally, his work addresses how the information consumers have about firms and the information firms have about consumers affect firm behavior. Professor Zettelmeyer has extensively studied the auto industry as a laboratory to understand the effects of customer information, investigating the effect of the Internet, the passthrough and effectiveness of promotions, and what consumers' online journeys predict about their purchase behavior.