This chapter considers the demands of the presidency alongside those of the legislative and judicial branch, highlighting the trade-off between deliberation and decision. The judicial branch is comprised of nine justices that can contemplate constitutionality, document their reasoning, and dissent from one another, while the legislative branch contains the Senate and House of Representatives, two large, deliberative bodies divided by party and constituencies. By contrast, there is one Chief Executive. During America’s constitutional convention, this arrangement prevailed against alternative models with more than one executive, and, in doing so, followed traditions of having a single monarch on the throne and a supreme general in the field. Implicitly, and sometimes explicitly justified, wisdom seems to dictate that executive responsibilities are best vested in a single person even at the sacrifice of aggregate wisdom. External debate unfolds slowly, whereas internal deliberation can happen almost instantaneously. Even assuming agreement, articulating ideas among nine, one hundred, or four hundred and thirty-five individual minds is cumbersome. Rapidity creates efficiency. In peace, cognitive efficiency allows executives to judiciously dispatch innumerable decisions; in war, cognitive efficiency allows executives to rapidly act on tactics, strategy, and geopolitical considerations. But if a brain is to deliberate and act efficiently, it must be robust, both in its components and connections. As prior chapters have shown, age brings general atrophy represented most basically by declining brain mass. At the same time, white matter tracts, responsible for integrating disparate brain regions that can be inches away within or across the brain’s hemispheres, decline in terms of integrity and efficiency. To the extent that age brings white matter degradation to the connectome, the efficiency of a single brain is diminished. The aged executive retains the potential for myopia, hubris, dogma, vice, and other liabilities that exist inside men’s minds unchecked by the perspective of others in counsel but loses its compensatory speed and efficiency.