Prior to becoming president, Donald Trump was widely known as a successful business executive. As a candidate, Trump promised to run government like his business. His supporters and critics, however, disagree about how the president has performed as a manager. In this article, we review President Trump's performance as a manager during his first year in office. We examine three dimensions of his approach-transition preparation, staffing, and management style. Notably, we find that the president's halting transition limited his effectiveness in the first year. Unlike previous presidents, President Trump chose neither a politicizing nor a centralizing strategy to gain control over administrative policy making during his first year. We also note that President Trump prefers a competitive and freewheeling decision-making environment but is struggling with the consequences of such a structure. The article concludes with an assessment of the first year and prospects for the president moving forward.