The term 'Pioneer in Late-Night TV' refers to the American comedian and talk show host, Jack Paar. He is best known for hosting The Tonight Show from 1957 to 1962. Paar was the first to introduce a more relaxed, conversational style of hosting, which was a stark contrast to the previous hosts of the show. His tenure on the show was highly successful and he is credited with revolutionizing the late-night television format.