Robert W. Plaster (1930–2008), a former Joplin Junior College student and the founder of Empire Gas. Formerly known as Matthews Hall and named after Norval M. Matthews (1895–1977), an original member of the school's board of regents from 1965 until his death, the building and the school of business, which has resided in it since its construction, were renamed after Plaster in 2006 when he made the largest donation in the college's history. Prior to this building's construction, the school of business had been located in the former Mission Hills mansion, today the Ralph L. Gray Alumni Center, from 1969 to 1980. Webster Hall (opened in 1992) is named for Richard M. Webster (1922–1990), a former speaker of the Missouri House of Representatives and a longtime state senator representing the area from 1962 until his death. The building cost $7.5 million at the time of its construction and is home to the social sciences, communications, foreign languages, and international studies departments. The W. Robert Corley Auditorium is located inside Webster Hall. It was named after William Robert Corley, a local businessman following a significant donation by him in 2009. Bud Walton Black Box Theatre (opened in 1999) is named for Bud Walton, brother of Walmart founder Sam Walton and a financial donor for the construction of the facility. The Walton Black Box Theatre was built as a replacement for the college's previous Barn Theatre, which was destroyed by fire in 1990. Julio S. Leon Health Sciences Center (opened in 2010) is named for Julio Leon, who served as the president of the University from 1982 to 2007. It houses programs in nursing, dental hygiene, kinesiology, medical technology, psychology, radiologic technology and respiratory therapy. Jeremiah "Jay" Nixon Hall (opened in 2019) is named for the 55th governor of Missouri Jeremiah "Jay" Nixon, who served from 2009 to 2017. Governor Nixon campaigned and received $5.2 million that was used to construct the hall and renovate the nearby Reynolds hall. Nixon hall is used for mathematics and other STEM fields. The building is three stories and houses staff offices, study rooms, and many classrooms. It is connected to Reynolds hall via a sky bridge on the second floor and is the newest building on campus. Alumni Center The Ralph L. Gray Alumni Center (opened in 2011) is named after Ralph L. Gray, a major donor for the building's restoration. The building, also known