Mathijs de Vaan is an Assistant Professor of Management of Organizations at the Haas School of Business at the University of California Berkeley. His research examines the wide variation in the costs and quality of health care. To do so, his work explores how social and organizational networks in which physicians and patients are embedded guide the implementation of incentives and the diffusion of information. Mathijs uses quantitative methods, mostly to analyze large medical claims datasets. Professor De Vaan’s research has been published in The American Journal of Sociology, Proceedings of the National Academy of Sciences, Management Science, the American Sociological Review, and Research Policy and has been featured in the Wall Street Journal, the Financial Times, Nature and other media outlets.