Nathaniel BrandenDr. Nathaniel Branden (born 1930) is a psychotherapist and author of books on psychology (in which he holds a Ph.D) and philosophy. He has also played a major role in promoting Ayn Rand's philosophy, which is known as Objectivism.
He met Ayn Rand in 1951, having previously read and admired her novel The Fountainhead, and the pair went on to have many discussions about Rand's Objectivist philosophy. They had an affair, despite both being married (with the full knowledge and approval of both spouses). Branden has written an account of this time, entitled My Years with Ayn Rand (1999).