Question: Ligo Scientific Collaboration appointed an American physicist as it's first spokesperson, who was a professor of physics at what university?

Context paragraphs:
LIGO Scientific Collaboration: The LIGO Scientific Collaboration (LSC) is a scientific collaboration of international physics institutes and research groups dedicated to the search for gravitational waves.  The LSC was established in 1997, under the leadership of Barry Barish.  Its mission is to ensure equal scientific opportunity for individual participants and institutions by organizing research, publications, and all other scientific activities, and it includes scientists from both LIGO Laboratory and collaborating institutions.  Barish appointed Rainer Weiss as the first spokesperson.

Bernard F. Schutz: Bernard F. Schutz (born August 11, 1946, in Paterson, New Jersey) is an American physicist.  His research is on Einstein's theory of general relativity, more concretely on the physics of gravitational waves.  He is one of the directors and head of the astrophysics group at the Max Planck Institute for Gravitational Physics in Potsdam, Germany.  He is principal investigator in charge of data analysis for the GEO600 collaboration (which, in turn, is part of the LIGO Scientific Collaboration, the largest concerted effort to directly detect gravitational waves).  Schutz is also a member of the science team coordinating the planning and development for the space-borne gravitational wave detector LISA (Laser Interferometer Space Antenna), and he was instrumental in the foundation of the electronic, open access review journal "Living Reviews in Relativity".

Gabriela González: Gabriela González, (born 24 February 1965 in Cordoba, Argentina ) is a professor of physics and astronomy at the Louisiana State University and was the spokesperson for the LIGO Scientific Collaboration from March 2011 until March 2017.  She has published several papers on Brownian motion as a limit to the sensitivity of gravitational-wave detectors, and has an interest in data analysis for gravitational-wave astronomy.

Bruce Allen (physicist): Bruce Allen (born May 11, 1959) is an American physicist and director of the Max Planck Institute for Gravitational Physics in Hannover Germany and leader of the Einstein@Home project for the LIGO Scientific Collaboration.  He is also a physics professor at the University of Wisconsin–Milwaukee.

Charles S. Hastings: Charles Sheldon Hastings (November 27, 1848 – January 31, 1932) was an American physicist known for his work in optics.  His father was Panet Marshall Hastings and his mother was Jane Sheldon Hastings.  The father was a physician and anatomy teacher at Hamilton College, New York, where Charles was born.  At the age of six the family moved to Hartford, Connecticut, where Charles received his early education.  Hastings entered Yale University's Sheffield School of Science in 1867 and received his bachelor's degree in 1870.  His early interest in astronomy and telescopes were likely due to Chester Lyman, Chair of Physics and Astronomy at the Sheffield School.  He then earned a PhD from Yale in 1873, and immediately was made an instructor in physics.  In 1875 he resigned to study in Germany and France until being named an associate at the new Johns Hopkins University in 1876.  He became an associate professor of physics at Johns Hopkins University and the first Chair of Professor of Physics of Sheffield Scientific School at Yale University.  He collaborated with John A. Brashear on the optical design of large telescopes including the 72 in reflector at Dominion Astrophysical Observatory and the 30 in photographic refractor at Allegheny Observatory.  His optical designs enabled much progress in astronomy at U.S. observatories.  The Hastings Triplet magnifying glass design is based on his optical formulae.  He was awarded the Elliott Cresson Medal in 1926.

Alberto Vecchio: Alberto Vecchio is a physicist, professor at University of Birmingham, in the School of Physics and Astronomy in the field of gravitational wave astronomy.  He was a contributor in the upgrade of LIGO to Advanced LIGO which resulted in the discovery of gravitational waves in February 2016.

Rainer Weiss: Rainer "Rai" Weiss ( ; ] ; born September 29, 1932) is an American physicist, known for his contributions in gravitational physics and astrophysics.  He is a professor of physics emeritus at MIT.  He is best known for inventing the laser interferometric technique which is the basic operation of LIGO.  Rainer Weiss was Chair of the COBE Science Working Group.

Alessandra Buonanno: Alessandra Buonanno is a theoretical physicist working in gravitational-wave physics and cosmology.  She is a director at the Max Planck Institute for Gravitational Physics (Albert Einstein Institute) in Potsdam, Germany, leading the "Astrophysical and Cosmological Relativity" division.  She holds a College Park professorship at the University of Maryland, College Park in College Park, Maryland, and is a meber of the LIGO Scientific Collaboration.

Keith Symon: Keith Randolph Symon was an American physicist working in the fields of accelerator physics and plasma physics.  Born March 25, 1920, he died December 16, 2013.  Symon graduated summa cum laude, Phi Beta Kappa, from Harvard in 1942 with a BA in Philosophy and Mathematics.  In 1948 he was awarded a PhD in Physics.  He taught physics at Wayne State University in Detroit until 1955.  Symon was professor of physics at the University of Wisconsin until his retirement in 1992 when he became emeritus professor.  From 1956 to 1967 he was on the staff of the Midwestern Universities Research Association (MURA), a collaboration of Big Ten universities, the University of Chicago and Notre Dame.  In 1982 and 1983 he was acting director of the Madison Academic Computing Center and from 1983 to 1985, acting director of the UW-Madison Synchrotron Radiation Center.  His textbook, "Mechanics", has been a staple in physics classes since publication of the first edition in 1953.  It has been published in multiple languages and is still in use around the world.

David Reitze: David Reitze (born January 6, 1961 in Washington, Pennsylvania) is an American laser physicist who is Professor of Physics at the University of Florida and served as the scientific spokesman of the Laser Interferometer Gravitational-Wave Observatory (LIGO) experiment in 2007-2011.  In August 2011, he took a leave of absence from the University of Florida to be the Executive Director of LIGO, stationed at the California Institute of Technology, Pasadena, California.  He obtained his BA in 1983 from Northwestern University, his PhD in Physics from the University of Texas at Austin in 1990, and had positions at Bell Communications Research and Lawrence Livermore National Laboratory, before taking his faculty position at the University of Florida.  He is a Fellow of the American Physical Society and The Optical Society.

Supporting paragraphs: LIGO Scientific Collaboration Rainer Weiss
Answer: MIT