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Carl Whitaker, MD, was an American physician and psychotherapy pioneer family therapist. Whitaker is most well-known for acknowledging the role of the entire family in the therapeutic process. He is the founder of experiential family therapy, or the symbolic-experiential approach to therapy. Rather than scapegoating one family member or even a specific family problem, experiential family therapy looks at the entire family system. Several other approaches to family therapy have drawn heavily from Whitaker's theories.
Albert Ellis, PhD, was an American psychologist who in 1955 developed Rational Emotive Behavior Therapy (REBT). He held M.A. and Ph.D. degrees in clinical psychology from Columbia University and American Board of Professional Psychology (ABPP). He also founded and was the President of the New York City-based Albert Ellis Institute for decades.
Based on a 1982 professional survey of US and Canadian psychologists, he was considered as the second most influential psychotherapist in history (Carl Rogers ranked first in the survey; Sigmund Freud was ranked third). Psychology Today noted, "No individual—not even Freud himself—has had a greater impact on modern psychotherapy."