I love these kinds of lists. Here are some famous people who were history majors in college. Notice that none of them became professional historians.
George W. Bush, Former President of the United States
Franklin D. Roosevelt, Former President of the United States
Antonin Scalia, Supreme Court Justice
Martha Stewart, Television personality
Katharine Hepburn, Actress
Bill Bradley, Former U.S. Senator and NBA Player
Kareem Abdul-Jabbar, NBA Hall of Famer
Ralph Winter, Movie producer of X-Men and Fantastic Four
Wolf Blitzer, CNN Anchor
Steve Carrell, Michael Scott from "The Office."
Bill O’Reilly, Fox News pundit
Richard Nixon, Former U.S. President
Sam Palmisano, CEO of IBM
Theodore Roosevelt, Former U.S. President
Will Forte, actor, comedian and writer on "Saturday Night Live."
Franklin D. Roosevelt, Former U.S. President
Newt Gingrich, Former Speaker of the House
Jackie Joyner-Kersee, Olympic athlete
Julia Child, famous chef
George McGovern, 1972 presidential candidate
Grant Hill, NBA player
Chelsea Clinton, daughter of Bill and Hilary and hedge-fund manager
Sonia Sotomayor, Supreme Court justice
Pat Robertson, televangelist
Joe Biden, Vice-President of the United States
Charlie Rose, journalist
Larry David, co-producer of Seinfeld
Gordon Brown, Prime Minister of England
Chris Meloni, plays Elliott Stabler on Law and Order: Special Victims Unit
Dean Cain, actor who played Superman on "Lois and Clark"
Orrin Hatch, U.S. Senator
Sacha Baron Cohen, comedian and star of "Borat"
Stockard Channing, Played "Rizzo" in Grease
Chris Berman, ESPN Sports Broadcaster
Charles Kurault, CBS newsman
Jimmy Buffett, singer
Conan O'Brien, Host of "The Tonight Show with Conan O'Brien"
Adlai Stevenson, Governor of Illinois, Presidential Candidate 1952
W.E.B. DuBois, Co-founder of the NAACP
Christa McAuliffe, Teacher who died in the Challenger
Carly S. Fiorina, CEO of Hewlett-Packard