Here are 3 examples that you can use for resignation letter as Assistant Professor -. Leaving a job isn't easy.We need a single letter or email from the faculty member or AP which indicates intent to resign or retire. Resignation letters should use the formal greeting: "Dear". The first sentence in the letter should state that you are resigning and when. Example: I'm writing to inform you of my decision to resign from my position as a park ranger with the National Park Service, effective May 1st. I am writing to formally tender my resignation from my position as an Assistant Professor at Crestwood High School, effective June 20, 2053. • Arizona Form A-4 (withholding). This appointment provides financial support in the form of a stipend for the period identified in the letter.