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. 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 -. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. The letter should be signed and attached to a cover e-mail. The date of retirement would normally be the end of either the fall or spring semester. Certification of Representation and Order to Negotiate. 1. Preamble. 3. Motivation letters can encourage employers to interview you.