Joan Welkowitz, PhD, was a Professor of Psychology at New York University. She directed the clinical program for ten years, and taught courses in methodology and statistics at both the graduate and undergraduate levels for more than twenty-five years.

Barry H. Cohen, PhD, is the Director of the master's program in psychology at New York University, where he has been teaching statistics for more than twenty years. He is the author or coauthor of two other successful statistics books also from Wiley–Explaining Psychological Statistics, Second Edition and Essentials of Statistics for the Social and Behavioral Sciences with R. Brooke Lea.

Robert B. Ewen, PhD, teaches advanced placement psychology at Gulliver Preparatory School in Miami, Florida. He previously taught statistics for eight years as an associate professor at New York University. He is also the author of a successful college text on theories of personality that is currently in its sixth edition.