Robert Witte earned his Ph.D. at Stanford University. He is an Emeritus Professor of Psychology at San Jose State University, where he taught courses in statistics for more than three decades. He has had a number of publications in peer-reviewed journals, as well as a number of nationally-competitive research grants and a post-doctoral Research Fellowship at Indiana University.  

John Witte is Professor of Epidemiology and Biostatistics at the University of California, San Francisco.  He received his PhD from the University of California, Los Angeles, and was previously on the faculty at the University of Southern California and Case Western Reserve University. He has published over 150 papers, and his research is primarily focused on statistical genetics and the genetic epidemiology of cancer.