Harry Allen Overstreet (October 25, 1875 – August 17, 1970) was an American writer and lecturer, and a popular author on modern psychology and sociology.
His 1949 book, The Mature Mind, was a substantial best-seller that sold over 500,000 copies by 1952.
From 1911 to 1936, he was chair of Department of Philosophy and Psychology at City College of New York.
[1] Overstreet also taught in the continuing education program of the New School for Social Research.
He lectured and worked frequently with his second wife, Bonaro Overstreet.