The Autobiography of a Clown is a memoir of Isaac Frederick Marcosson, a journalist and author who was also known for his humorous writings. The book follows his life from childhood to adulthood, describing his experiences in the circus, as well as his travels around the world. Marcosson provides insights into the lives of circus performers and their daily struggles, as well as his own personal struggles with identity and purpose. Throughout the book, he reflects on his own life and the meaning behind his work as a clown, offering a unique perspective on the nature of humor and the role it plays in our lives.