Blessed John XXIII National Seminary 558 South Ave, Weston, MA02493 Blessed John XXIII National Seminary is a Catholic seminary for mature, second-career students who are between the ages…More of thirty and sixty. Its seminarians have gone on to serve parishes all over the world. Since its founding in 1964, it has graduated nearly 600 alumni. Rev. William B. Palardy is Rector and President.