Yes, you do need an executor--which could be your wife herself. The executor is simply the person who "executes"--or carries out--the will: he or she probates the will, pays final expenses, helps take care of tax obligations, "gathers" the different assets (bank accounts, vehicles, etc.)...it's an administrative position. If your wife would not want to do that, a good choice is an attorney or accountant; they would be well-prepared to deal with the paperwork.