Theo Epstein's departure from the Red Sox to become the Cubs' president of baseball operations was the genesis of a front-office exodus throughout the country: It created G.M. openings in Boston and San Diego and caused a migration to Chicago of lieutenants who helped Epstein build the Red Sox' 2004 and '07 championship teams. A network of Epstein protégés has now spread throughout the game.
Under Epstein: Red Sox assistant G.M., 2005--09
Now: Cubs G.M.
Under Epstein: Red Sox director of amateur scouting, 2005--09
Now: Cubs senior VP, scouting and player development
Under Epstein: most recently Red Sox assistant G.M., 2009--11
Now: Red Sox G.M.