The early host of 'The Tonight Show' was Jack Paar, a four-letter word. Paar was an American radio and television comedian, talk show host, and actor. He is best remembered for his stint as the host of 'The Tonight Show' from 1957 to 1962. Paar was known for his wit, his ability to find humor in everyday situations, and his frequent use of one-liners. He was also known for his controversial moments, such as walking off the show in protest of censorship.