Mortimer Adler was an American philosopher, educator, and author, best known for his work in the field of education and his advocacy for the Great Books of Western Civilization. He co-founded the Great Books Foundation and played a significant role in promoting liberal education, emphasizing the importance of critical thinking and discussion in learning. Adler also contributed to the field of philosophy through his writings, including the influential book, How to Read a Book. He believed that reading should be an active process, encouraging readers to engage deeply with texts to enhance understanding and appreciation of literature and ideas.