Dr. Jim Koehler is Principal Statistician at Google. His work focuses on statistical models for Google's ads business. He received a double A.B. in Statistics and Applied Mathematics from U.C. Berkeley and a PhD in Statistics from Stanford University in 1990. Prior to Google he was a tenured Associate Professor of Statistics at the University of Colorado and has over 15 years of industry experience in Marketing, Environmental Engineering, Telecommunications, Statistical Genetics, and Chemometrics.