Northern Illinois University College of Law Dean Eric Dannenmaier resigned on Monday, four months after he voluntarily went on paid administrative leave amid an investigation into workplace misconduct.Dannenmaier, who began as the school’s dean last June, may continue in another position at the school, according to a statement from university spokesman Joe King.“In February, upon learning of an investigation into alleged improper conduct in the workplace, Dean Dannenmaier voluntarily went on administrative …