Schueler, who served his previous two seasons as senior advisor of player personnel for the Giants, was GM of the White Sox from 1990-2000. During that time, Chicago compiled a .527 winning percentage and won two division titles. In '00, his final season as GM, Schueler's White Sox were named Organization of the Year by "Baseball America."
Schueler, a 42-year baseball veteran and former pitcher, also served in various special-assistant capacities with the Cubs, Cardinals and Athletics, earning World Series rings with St. Louis ('06) and Oakland ('89).
Singer, who joined the Nats in '06 after a three-year stint with the D-backs as a scout under Rizzo, will be in charge of coordinating, scheduling and administering all Nationals Major League, Minor League and Winter League scouting efforts.
Singer was a two-time All-Star during his pitching career, one that included a pair of 20-win seasons and 118 career victories. He has more than 30 years of professional baseball experience in various capacities.
Alden Gonzalez is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.