The depression era also saw the commissioning by President Homer Rainey (1931–35) of architect Jens Larsen to design Bucknell's master plan. Subsequent expansion of the university still largely adheres to this plan. The post-War period saw a dramatic increase in university enrollments across the United States, thanks first to the G.I. Bill and then to the baby boom. Like other institutions, Bucknell's campus grew to accommodate a growing student body, and the university broke ground on many of the academic buildings that comprise upper campus. Chief among these is the Ellen Clarke Bertrand Library, commissioned in 1946 under Bucknell President and former Governor of Maine Horace Hildreth and opened in 1951. Other major additions from the building spree of the 1950s and 60s include the Olin Science Building and Coleman, Marts, and Swartz Halls. The 1970s brought construction of the Elaine Langone Center, the Gerhard Fieldhouse, and the Computer Center, while in the 1980s, the capacity of the Bertrand Library was doubled, facilities for engineering were substantially renovated, and the Weis Center for the Performing Arts was inaugurated. Heading into the 21st century, new facilities for the sciences included the renovation of the Olin Science Building, the construction of the Rooke Chemistry Building in 1990 and the completion of a new Biology Building in 1991. The McDonnell Residence Hall and Weis Music Building were inaugurated in 2000, the O'Leary Building for Psychology and Geology opened in the fall of 2002, and the new Kenneth Langone Recreational Athletic Center opened during the 2002–03 academic year. The newest engineering facility, the Breakiron Engineering Building, opened in 2004. Academic West opened in fall 2013. It added of academic space; of which are classroom and hearth spaces. Academic West houses the departments of economics, geography, international relations, political science, sociology/anthropology, and the Latin American Studies and Environmental Studies Programs. The South Campus Apartment Buildings and MacDonnell Commons were opened in 2015, providing upperclassmen with apartment-style housing that offers a more independent residential experience. In 2018, Hildreth-Mirza Hall opened as the home to Bucknell's Center for the Humanities, Bucknell University Press, and the Griot Institute for the Study of Black Lives and Culture. Academic East was inaugurated in 2019. It houses the Department of Education and programs in the College of Engineering. A new building that will house the Freeman College of Management and the Department of Art and Art History is currently under construction.