Usage patterns
〈事〉のディレクターを務めるto serve as director of (a project, show, etc.)
He is serving as the director of a new TV program.
ディレクターに就任するto be appointed as director
She will be appointed the new director starting next month.
ディレクターとして活躍するto work actively in the role of director
He is active as a director in the advertising industry.