The Marianna Brown Dietrich College of Humanities and Social Sciences (Dietrich College or DC) is the liberal and professional studies college and the second largest academic unit by enrollment at Carnegie Mellon University in Pittsburgh, Pennsylvania, USA. The college emphasizes study through rigorous analysis and technology and the behaviors, institutions, and beliefs that constitute the human experience. 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.