Barbara Klein, PhD, is an identical twin who has devoted her career to twin-identity development. She has written four books helping parents and twins alike deal with fighting and loneliness, and speaks nationally and internationally to twins about building more authentic relationships with their others.

Stephen Hart, PhD, is an identical twin. A lifelong student of psychology, he has worked with the Sandhurst Department of Communications and Applied Behavioral Science to support their teaching of the "Understanding Self" and "Understanding Other" modules of the Reading University-accredited Postgraduate Certificate in Leadership and Strategic Studies.

Jacqueline Martinez, PhD, is an identical twin. She is an associate professor at Arizona State University where she studies and teaches courses on communication, semiotics, and phenomenology. Her published work includes Phenomenology of Chicana Experience and Identity: Communication and Transformation in Praxis (2000) and Communicative Sexualities: A Communicology of Sexual Experience (2011).