DePaul University College of Law Dean Gregory Mark will resign at the end of the academic year. Mark informed the school of his decision at a faculty meeting on Jan. 23. Following the end of the 2013-2014 school year, Mark will take a one-year leave of absence before returning as a law school faculty member in the fall of 2015. “I have a number of research and writing projects that I am very interested in doing,” Mark said. “And I am also probably going to be able to take my son on a graduation …