The Marianna Brown Dietrich College of Humanities and Social Sciences (Dietrich College) is the liberal and professional studies college and the second largest academic unit by enrollment (after the Carnegie Mellon College of Engineering) at Carnegie Mellon University in Pittsburgh, Pennsylvania, USA. The college emphasizes study through rigorous analysis and technology the behaviors, institutions, and beliefs that constitute the human experience, describing itself as “not an ordinary liberal arts school.” The college was named for Marianna Brown Dietrich, the mother of philanthropist William S. Dietrich II after his donation of $265 million to the university in 2011 – the largest single donation in Carnegie Mellon history.