Robert William Unser (February 20, 1934 – May 2, 2021) was an American automobile racer. At his induction into the Motorsports Hall of Fame of America in 1994, he had the fourth most IndyCar Series wins at 35 (behind his brother Al, A. J. Foyt, and Mario Andretti). Unser won the 1968 and 1974 United States Automobile Club (USAC) national championships. He won the Pikes Peak International Hill Climb overall title 10 times (13 times when class wins are included).