Here are 3 examples that you can use for resignation letter as Assistant Professor -. Fill out the form on this page to get a free editable Google Docs template with sample teacher resignation letters to help you compose your own.A formal written notice announcing intention to leave a job. Resignation letters should use the formal greeting: "Dear". The first sentence in the letter should state that you are resigning and when. I am writing to formally tender my resignation from my position as an Assistant Professor at Crestwood High School, effective June 20, 2053. This is to inform you of my intention to resign. My last day of work will be (DATE).