· Senior Principal Research Scientist, Amazon2015–
· Principal Research Scientist, Yahoo labs2014–2015
· Marie And Joseph Melone Professor Of Statistics At The Wharton School, University of Pennsylvania1992–
· Professor Of Statistics, University of Chicago Booth School of Business1988–1992
· PhD, Statistics, University of Maryland1984–1988
· Master of Science - MS, Computer Science, Rutgers University1982–1984
· Master of Arts - MA, Mathematics, University of Maryland College Park1980–1982
· Bachelor of Science - BS, Biochemistry, University of Maryland College Park1977–1980