Nancy Segal: Twins and What They Tell Us About Human Behavior


Exclusive TPI interview with Nancy Segal, Ph.D.

Click “Add to cart” to purchase this audio.

Would you like one APA CE credit for listening to this interview? In your shopping cart you will have the option of ordering the CEU in addition to the mp3 recording. Or click here.

TPI members – get your 100% off discount code here.


Meet the Authors: An Interview with Nancy L. Segal, Ph.D.
Recorded Friday January 16, 2015

Dr. Segal is author of Entwined Lives: Twins and What They Tell Us About Human Behavior, published by Dutton.

Book Description:

Bringing together the latest, cutting-edge research, with illustrative case histories of twins and their families, preeminent twin researcher Dr. Nancy L. Segal explores ways in which twins enhance our knowledge of human behavioral and physical development. How twins hold a mirror up to ourselves is reflected in real-life stories like those of Jim Lewis and Jim Springer, identical twin brothers separated at birth and reunited at age thirty-nine. In addition to having the same jobs, cars, hobbies, and health histories, each discovered in the other a long-lost best friend, in-laws, and nieces and nephews. Bernard J. Shapiro, Ph.D., and Harold T. Shapiro, Ph.D., the only known twins to share the distinction of becoming presidents of leading universities, were uncertain if they were identical or fraternal twins until the age of sixty-two. These, along with many other case histories documented in this fascinating book, go a long way toward helping us solve our behavioral riddles.

About Dr. Segal:

Dr. Nancy L. Segal received a B.A. degree from Boston University (1973) and an M.A. degree (1974) and Ph.D. degree (1982) from the University of Chicago. She is currently Professor of Developmental Psychology and Director of the Twin Studies Center, at California State University, Fullerton. She has been recognized as CSU Fullerton Outstanding Professor of the Year. Dr. Segal also received the James Shields Award for Lifetime Contributions to Twin Research from the Behavior Genetics Association and International Society for Twin Studies.
Dr. Segal is a Fellow of the American Psychological Association, American Psychological Society and Western Psychological Association.  She is an Associate Editor for the journal Twin Research and Human Genetics and was Contributing Research Editor for Twins Magazine from 1984-1998 and is a member of the Advisory Board for the Center for Loss in Multiple Birth. She has served as Assistant Director of the Minnesota Center for Twin and Adoption Research. She has appeared on Good Morning America, the Oprah Winfrey Show, Dateline NBC and the Today Show, in addition to other nationally and locally televised programs. Her research program includes twin and adoption studies that are specially designed to address problems and issues concerning human development in general, and twin development in particular. Dr. Segal’s papers have appeared in prestigious journals, such as American Psychologist, Child Development and Science.
Learning Objectives:

  • List two psychological characteristics that twins generally share that other siblings do not
  • List one psychological similarity and once difference between fraternal and identical twins