Paul D. Tieger and Barbara Barron are internationally recognized experts on and the authors of five breakthrough books about Personality Type, including the one-million copy bestseller Do What You Are, which changed the way career consulting is practiced all around the world. They have been training professionals in the use of Personality Type for thirty-two years.

Kelly Tieger graduated from Sarah Lawrence and has been exposed to Personality Type her whole life. She contributed research to the fourth edition of Do What You Are.