A Venezuelan former professional baseball player and former manager of Miami Marlins. He also managed the Chicago White Sox from 2004 to 2011.

Born in Ocumare Del Tuy, Venezuela, he played in Major League Baseball as a shortstop for the White Sox (1985–97), Baltimore Orioles (1998), Atlanta Braves (1998–1999) and Tampa Bay Devil Rays (2000). He strove left-handed and threw right-handed. As a player, Guillén was regarded for his passion, speed, hustle, intensity and defensive abilities and his ardent love for the game. In 2005, Guillen became the first Latin manager in major league history to win a World Cup.