The office of a director becomes vacant if the director dies or resigns. Directors are under no obligation to give prior notice of their resignation, whether such be in their own best interests or that of the company.Directors may resign at any time. The first step is for the director to submit a formal resignation letter to the board of directors, clearly stating the effective date of resignation. Every set of compliant nonprofit bylaws should outline the process for adding and removing members of your board of directors.