Jeremy Matthew Wariner (born January 31, 1984) is a retired American track athlete specializing in the 400 meters. He has won four Olympic medals (three gold, one silver) and six World Championships medals. He is the fourth fastest competitor in the history of the 400 m event with a personal best of 43.45 seconds, behind Wayde van Niekerk (43.03 WR, 2016), Michael Johnson (43.18 WR, 1999) and Butch Reynolds (43.29 WR 1988) and the fifth fastest all-time mark when set it in 2007.