Comedian and actor Jerry Lewis has said that Allen Klein is “a noble and vital force watching over the human condition.” Klein is the world’s only “Jollytologist,” and author of 18 books that have sold over 500,000 copies. Those books include the best-selling book,The Healing Power of Humor, as well as Always Look on the Bright Side: Celebrating Each Day to the Fullest, The Courage to Laugh, Learning to Laugh When You Feel Like Crying, Inspiration for a Lifetime, Change Your Life!: A Little Book of Big Ideas and The Art of Living Joyfully. Allen's latest book is Having the Time of Your Life: Little Lessons to Live By.
Klein is also the recipient of a Lifetime Achievement Award from the Association for Applied and Therapeutic Humor, a Certified Speaking Professional designation from the National Speakers Association, a Toastmaster’s Communication and Leadership Award, and an honoree in New York City’s Hunter College Hall of Fame.