John Bunyan was an English writer and preacher who lived in the 17th century. He is best known for his work "The Pilgrim's Progress," which is considered one of the most significant works of religious English literature. Bunyan's writing style is characterized by its allegorical and symbolic elements, and his work has had a lasting impact on Christian literature and thought. He was also a prominent figure in the nonconformist movement in England, and his writings continue to be widely read and studied today.