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. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. Here are 3 examples that you can use for resignation letter as Visiting Assistant Professor -. In this article, we share tips for writing a short, simple resignation letter and offer examples for you to reference when creating your own. I am writing to formally tender my resignation from my position as an Assistant Professor at Crestwood High School, effective June 20, 2053. You will need to state your resignation, indicate your expected final date of employment as well as offer support in the transition process.