Warshak (born December 18, 1949) is an American clinical and research psychologist and author.
He is best known for his expertise on child custody, shared parenting, and parental alienation disputes in the context of divorce.
Warshak has written three books, The Custody Revolution, Divorce Poison: Protecting the Parent-Child Bond From a Vindictive Ex, and the revised edition, Divorce Poison: How to Protect Your Family from Bad-mouthing and Brainwashing.