In the past decade, he has criticized the university and the dental school (including in lawsuits) for what he believes to be the lowering of academic standards for minority dental students and the Board of Regents’ authority over grading, promotion, and graduation of students. Yohn has filed lawsuits against the University of Michigan administration and board of regents, published articles, and sent a number of emails to the dental school faculty regarding his opinions on these issues and regarding his belief that he had the right to communicate about them over email. During one set of interactions in August 2005, the chair of his department, Paul Krebsbach, asked that he stop sending emails to the rest of his department, perhaps because they were irritating or angering his colleagues.