In April, as decreed by the Church of England, we commemorate the life of William of Ockham, an English Franciscan friar and scholastic philosopher who has influenced modern organizational theory—but not enough. Peter Drucker’s medieval counterpart offered the observation that “entities must not be multiplied beyond necessity,” although these exact words never actually appear in his writing. Unlike Drucker’s best advice, however, modern organizational practioners have quickly forgotten or disregarded the sage counsel of the wise brother.