Here are 3 examples that you can use for resignation letter as Assistant Professor -. Resignation letters should use the formal greeting: "Dear".The first sentence in the letter should state that you are resigning and when. When leaving the university, you must submit a letter of resignation to your manager and HR providing your last day of work. If the appointee wishes to resign early, an official notice of resignation should be processed at least one month prior to the effective date of resignation. The department will need a signed statement indicating the employee's last day of work. I have provided my employing unit(s) with a signed letter (email is sufficient) indicating my resignation or retirement, including my last work day. Resignation Heading link.