Alex Mullen (born March 3, 1992) is an American memory grandmaster and medical student, and the current world memory champion. The first American to win the world title, he won the 2015 and 2016 world championships and is currently the world No. 1 ranked memory competitor. He is also the current USA memory champion.Along with his wife, he runs Mullen Memory, a nonprofit which “provides free resources exploring memory palaces as learning tools.”

As of Dec. 6, 2016, Mullen held 9 memory world records and 12 American records. He is the first person to memorize the order of a deck of playing cards in under 20 seconds at an official competition. He is also the first to memorize more than 3,000 decimal digits in one hour.