Although there is no one definitive answer as to who is the most successful Pulitzer Prize-winning author of all time, Toni Morrison is widely considered to be the most successful. Morrison won the Pulitzer Prize in 1988 for her novel, "Beloved," and has since won many other awards, including the Nobel Prize in Literature in 1993. Her works, which explore themes of racism, slavery, gender, and family, have been widely acclaimed as some of the most powerful and influential pieces of literature in the 20th century.