Linda Wasmer Andrews, MS: Science writer specializing in psychology, Albuquerque, New Mexico. Wrote entries on Albert Bandura, Alfred Binet, and Robert Yerkes.

Paula Ford-Martin, MA: Clinical and consumer medical writer, Wordcrafts, Warwick, Rhode Island. Wrote entries on Ivan Pavlov and Mary Ainsworth.

Rebecca Frey, PhD: Science and medical freelance writer, New Haven, Connecticut. Wrote entries on Aaron Beck, Carl Jung, Lawrence Kohlberg, and Kurt Lewin.

Gary Gilles, MA, LCPC: Psychologist and freelance writer, Chicago, Illinois. Wrote entries on Sigmund Freud and B.F. Skinner.

Clare Hanrahan, BS (Psychology): Author and researcher, CelticWordCraft, Asheville, North Carolina. Wrote entries on Kenneth Bancroft Clark and Jean Piaget.

Denise Schmutte, PhD (Clinical psychology): Freelance writer, Edmonds, Washington. Wrote entry on Abraham Maslow.

Joan Schonbeck, RN: Nurse and freelance writer, Marlborough, Massachusetts. Wrote entries on Karen Horney, Carl Rogers, and Max Wertheimer.

J.E. Spehar: Freelance biographer and science writer, Canton, Ohio. Wrote entries on George Kelly, Wilhelm Wundt, and Anne Anastasi.