Reiser managed in the minors for several years (including the Kokomo Dodgers in 1956–57, among others), winning the 1959 Minor League Manager of the Year Award from The Sporting News. He served as a coach on Walter Alston's Los Angeles Dodger staff from 1960 to 1964 (including the 1963 world championship team). However, he was forced out in 1965 as manager of the AAA Spokane Indians as the result of a heart attack. His replacement was Duke Snider—the man who had once replaced him as Brooklyn Dodger center fielder.