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. Employment Termination Checkout. Terminating full-time staff and faculty, are required to complete the Employee Termination Checkout form. Here are 3 examples that you can use for resignation letter as Visiting Assistant Professor -. "Our country is facing a grave challenge," Freeland wrote in her resignation letter. Theodore John Kaczynski also known as the Unabomber was an American mathematician and domestic terrorist.