Answer by taking a quote from the following article:

Andrew Lamar Alexander Jr. (born July 3, 1940) is an American politician serving as the senior United States Senator from Tennessee, a seat he has held since 2003. A member of the Republican Party, he also was the 45th Governor of Tennessee from 1979 to 1987 and the 5th United States Secretary of Education from 1991 to 1993. Born in Maryville, Tennessee, Alexander graduated from Vanderbilt University and the New York University School of Law. After establishing a legal career in Nashville, Tennessee, Alexander ran for Governor of Tennessee in 1974, but was defeated by Democrat Ray Blanton.

After graduating from law school, Alexander clerked for United States Court of Appeals for the Fifth Circuit Judge John Minor Wisdom in New Orleans, Louisiana, from 1965 to 1966.  In 1967, Alexander worked as a Legislative Assistant for Senator Howard Baker. While a staffer, he was briefly roommates with future U.S. Senator Trent Lott, and met his future wife at a staffer softball game. In 1969, he worked for Bryce Harlow, President Richard Nixon's executive assistant. In 1970, he moved back to Tennessee, serving as campaign manager for Memphis dentist Winfield Dunn's successful gubernatorial bid. Dunn was the first Republican in 50 years to win the governorship. After this campaign, Alexander worked as a partner in the Nashville law firm of Dearborn and Ewing. Meanwhile, Alexander rented a garage apartment to Thomas W. Beasley, a student at the Vanderbilt Law School who later co-founded Corrections Corporation of America.  The Tennessee State Constitution at the time prevented governors from serving consecutive terms, so with Dunn unable to run, Alexander sought the party's nomination for Governor in 1974. He defeated his two chief opponents, Commissioner of Mental Health Nat T. Winston, Jr., and Southwestern Company president Dortch Oldham, 120,773 votes to 90,980 and 35,683, respectively. He faced the Democratic nominee, Ray Blanton, a former Congressman and unsuccessful 1972 Senate candidate, in the general election. Blanton attacked Alexander for his service under Nixon, who had resigned in disgrace several months earlier as a result of the Watergate scandal, and defeated Alexander on election day, 576,833 votes to 455,467.  After the 1974 campaign, Alexander returned to the practice of law. In 1974, TIME Magazine named Alexander one of the 200 Faces of the Future. In 1977, Alexander once again worked in Baker's Washington office following Baker's election as Senate Minority Leader.

What else has he accomplished?
In 1974, TIME Magazine named Alexander one of the 200 Faces of the Future.