In 1946, Yogananda published his life story, Autobiography of a Yogi. It has since been translated into 45 languages. In 1999, it was designated one of the "100 Most Important Spiritual Books of the 20th Century" by a panel of spiritual authors convened by Philip Zaleski and HarperCollins publishers. Autobiography of a Yogi is the most popular among Yogananda's books.