Here is a comprehensive summary of the Wikipedia article about Rand Paul:
Randal Howard "Rand" Paul, born in 1963, is a prominent Republican politician who has served as the junior U.S. Senator from Kentucky since 2011, having been re-elected in 2016 and 2022. An ophthalmologist by profession, he earned his medical degree from Duke University in 1988 and practiced in Bowling Green, Kentucky, from 1993 until his election to the Senate. Paul describes himself as a constitutional conservative and Tea Party supporter, and his libertarian views are often compared to those of his father, Ron Paul, a well-known former congressman and three-time presidential candidate. His political career also includes a notable bid for the Republican nomination in the 2016 U.S. presidential election.