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. This is to inform you of my intention to resign. My last day of work will be (DATE). I am writing to formally tender my resignation from my position as an Assistant Professor at Crestwood High School, effective June 20, 2053. Here are 3 examples that you can use for resignation letter as Visiting Assistant Professor -. They will be immediately relieved of their duties for the remainder of the academic year. A copy of the letter will be placed on file in the Office of.