Question: In what city is the main campus of the university where the Opera Theatre of Saint Louis presents its performances?
Context: Dorothy Byrne is an American operatic mezzo-soprano.  She has performed leading and comprimario roles at several opera houses in the United States, including the Metropolitan Opera, the Lyric Opera of Chicago, the Chicago Opera Theater, the Boston Lyric Opera, the Des Moines Metro Opera, the Hawaii Opera Theatre, the Kentucky Opera, the Minnesota Opera, and the Opera Theatre of Saint Louis among others.  She portrayed the role of Rosalind in the Glimmerglass Opera's 2005 production of Richard Rodney Bennett's "The Mines of Sulphur" and participated in the company's recording which was nominated for a Grammy Award for Best Opera Recording.  She returned to Glimmerglass in 2006 to portray Mme. Follenvie in the world premiere of Stephen Hartke's "The Greater Good, or the Passion of Boule de Suif".  In 2007 she performed the role of Lydia in the premiere of David Carlson's "Anna Karenina" at the Florida Grand Opera. Champion is an African-American boxing opera in two acts and ten scenes, with music by Terence Blanchard and a libretto by Michael Cristofer.  Based on the life of welterweight prize fighting champion Emile Griffith, this opera is a joint co-commission by Opera Theatre of Saint Louis (OTSL) and Jazz St. Louis.  It received its premiere at the Loretto-Hilton Center for the Performing Arts, Webster University, on 15 June 2013.  The opera received its second production, with a revised orchestration by Blanchard, by Opera Parallèle in San Francisco, in collaboration with SFJAZZ, in February 21, 2016.  The third production of the opera was in March 5, 2017 by Washington National Opera at the John F. Kennedy Center for the Performing Arts. Allen Moyer (born 1958) is an American set designer particularly known for his work in operas and Broadway musicals.  He grew up in Schuylkill Haven, Pennsylvania and holds a BA from the Pennsylvania State University and a MFA degree from New York University's Tisch School of the Arts where he studied under John Conklin.  His designs have appeared in celebrated productions at the New York City Opera, the San Francisco Opera, the Santa Fe Opera, the Opera Theatre of Saint Louis, and the Seattle Opera.  He notably staged the world premiere of Stewart Wallace's "Harvey Milk" at the Houston Grand Opera in 1995 and the world premiere of Ricky Ian Gordon's "The Grapes of Wrath" at the Minnesota Opera in 2007.  He designed his first set for the Metropolitan Opera for their new production of Gluck's "Orfeo ed Euridice" which premiered on May 2, 2007. Stephen Paulus (August 24, 1949 – October 19, 2014) was a Grammy winning American composer, best known for his operas and choral music.  His best-known piece is his 1982 opera "The Postman Always Rings Twice", one of several operas he composed for the Opera Theatre of St. Louis, which prompted "The New York Times" to call him "a young man on the road to big things".  His style is essentially tonal, and melodic and romantic by nature.  He received grants from the National Endowment for the Arts and Guggenheim Foundation and won the prestigious Kennedy Center Friedheim Prize.  He was commissioned by such notable organizations as the Minnesota Opera, the Chamber Music Society of Lincoln Center, Opera Theatre of Saint Louis, the Saint Louis Chamber Chorus, the American Composers Orchestra, the Dale Warland Singers, the Harvard Glee Club and the New York Choral Society.  Paulus was a passionate advocate for the works and careers of his colleagues.  He co-founded the American Composers Forum in 1973, the largest composer service organization in the U.S., and served as the Symphony and Concert Representative on the ASCAP Board of Directors from 1990 until his death (from complications following a stroke in July 2013) in 2014. Opera Theatre of Saint Louis (OTSL) is an American summer opera festival held in St. Louis, Missouri.  Typically four operas, all sung in English, are presented each season, which runs from late May to late June.  Performances are accompanied by the St. Louis Symphony Orchestra, which is divided into two ensembles, each covering two of the operas, for the season.  The company's performances are presented in the Loretto-Hilton Center for the Performing Arts on the campus of Webster University. Saint Louis University School of Law, also known as SLU LAW, is a private American law school located in St. Louis, Missouri.  It is one of the professional graduate schools of Saint Louis University.  Opened in 1843, it is the first law school west of the Mississippi River.  The school has been ABA approved since 1924 and is a member of the Association of American Law Schools.  Housed in Scott Hall, the law school has the highest enrollment of law students in Missouri .  It offers both full- and part-time programs.  The school is also home to Saint Louis University's Vincent C. Immel Law Library, which is one of the largest law libraries in the state of Missouri.  Supreme Court Justice Clarence Thomas studied for his bar exam at the old Omer Poos Law Library on the main SLU campus. Saint Louis College (SLC) is a college in City of San Fernando, La Union, Philippines.  It was founded by the Congregatio Immaculati Cordis Mariae (CICM).  There are also sister schools of SLC, like Saint Louis University(SLU) in Baguio, University of Saint Louis Tuguegarao (USL) in Tuguegarao City, Saint Louis College of Cebu in Mandaue, Cebu, Saint Mary's University (Philippines) in Bayombong, Nueva Vizcaya, and Maryhill School of Theology in Quezon City. Michael Chioldi (born May 24, 1970) is an American operatic baritone who has performed at many major American opera houses and festivals, including the Metropolitan Opera, San Francisco Opera, Washington National Opera, Houston Grand Opera, San Diego Opera, Santa Fe Opera, Los Angeles Opera, Palm Beach Opera, Long Beach Opera, Minnesota Opera, Spoleto Festival USA, Arizona Opera, Utah Opera, New York City Opera, Fort Worth Opera, Chautauqua Opera, Kentucky Opera, Glimmerglass Opera, Hawaii Opera Theatre, Santa Fe Concert Association, Lyric Opera of Kansas City, Chicago Opera Theatre, Austin Lyric Opera, New Orleans Opera, Odyssey Opera, Michigan Opera Theatre and Vermont Opera Project. The Saint Louis University Ice Pavilion is a proposed project by Saint Louis University to build an indoor ice and sports facility to be constructed in concert with another project already in progress, the Chaifetz Arena.  The university is planning to build an on-campus ice arena, to be named 'SLU Ice Pavilion.'  The facility will host youth, high school, college hockey as well as special events; it will have a seating capacity of 2,300, and offer four youth hockey locker rooms, Saint Louis University Locker rooms (D1 and D2), four Prep School Locker rooms, conditioning and weight room.  As well as common and quiet study lounges for students and private offices and two private suites to be used for special events and/or VIP use.  The Ice Pavilion will also offer activities such as public skating, figure skating clubs, speed skating clubs, intramural broomball, intramural hockey, curling clubs, and learn-to-skate opportunities for the students and faculty.  The plans for this new Ice Pavilion were in response to the need for a closer facility to the Saint Louis University campus.  The current facility in use, the Summit Center in Chesterfield, MO, is approximately 21 miles away from SLU's campus, with average crowd sizes of 250-400 in attendance. Webster University is an American non-profit private university with its main campus in Webster Groves, Missouri.
Answer: Webster Groves, Missouri