Carl Sagan and Carl Reiner were both influential figures in the 20th century. Sagan was an American astronomer, astrophysicist, cosmologist, author, and science communicator, while Reiner was an American actor, comedian, director, producer, and writer. Sagan is best known for his popular science books and for hosting the television series Cosmos: A Personal Voyage. Reiner is best known for creating The Dick Van Dyke Show, directing films such as The Jerk, and appearing in films such as Ocean's Eleven. Both Sagan and Reiner were highly respected in their respective fields and made significant contributions to the world of science and entertainment.