Mortimer Jerome Adler (; December 28, 1902 – June 28, 2001) was an American philosopher, educator, encyclopedist, author, and lay theologian. His philosophical work was situated within the Aristotelian and Thomistic traditions. Adler taught at Columbia University and the University of Chicago, served as chairman of the board of editors of Encyclopædia Britannica, and founded the Institute for Philosophical Research. He resided for extended periods in New York City, Chicago, San Francisco, and San Mateo, California.
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