The director will go up on stage, but there are two things. In the United States, when a film wins an Oscar for best film, it's the producer or producers who climb up on stage as the film's producers. However, the author as such, the person who created the work, is the director. The Oscar awards, which are production awards, reward the director with a special award for that category, but his role as director is that of having created the work and of being its author.
