Stewart, who had similar responsibilities, became the U.S. men's national team's general manager on Aug. 1.
At RB Salzburg, Tanner headed its youth division. It won the UEFA Youth League championship in 2017 and reached the semifinals in 2018.
Among the players who came through the academy program at Salzburg are Senegalese star Sadio Mane and Guinean Naby Keita, who both play for Liverpool, and 21-year-old Croatian Duje Caleta-Car(Marseille).
While at 1860 Munich, Tanner brought then-14-year-old Bobby Wood from California to Germany.