Question: What university that Rudy Keeling coached for was an R1 institution?

Context paragraphs:
University of Alabama at Birmingham: The University of Alabama at Birmingham (UAB) is a public research university in Birmingham in the U.S. state of Alabama.  Developed from an academic extension center established in 1936, the institution became an autonomous institution in 1969 and is today one of three institutions in the University of Alabama System and the only R1 research institution in the state.  In the fall of 2015, 19,656 students from more than 110 countries were enrolled at UAB pursuing studies in 140 programs of study in 12 academic divisions leading to bachelor's, master's, doctoral, and professional degrees in the social and behavioral sciences, the liberal arts, business, education, engineering, and health-related fields such as medicine, dentistry, optometry, nursing, and public health.

University of Mississippi: The University of Mississippi (colloquially known as Ole Miss) is an American public research university located in Oxford, Mississippi.  It is the state of Mississippi's flagship and largest university, with a total enrollment of 24,250 in fall 2016.  It is both a sea-grant and space-grant institution and is classified as an "R1: Doctoral University — Highest Research Activity".  Across all its campuses, it comprises approximately 2,200 faculty members, 10,600 staff members, and 24,000 students, and has a total budget of roughly $2 billion.  About 55 percent of its undergraduates and 60 percent overall come from Mississippi, and 23 percent are minorities; international students come from 90 nations.

Rudy Keeling: Harold Rudolph "Rudy" Keeling (March 14, 1947 – July 6, 2013) was an American college basketball coach and administrator.  He was a Division I head basketball coach at the University of Maine and Northeastern University, before becoming Athletic Director at Emerson College and commissioner of the Eastern College Athletic Conference (ECAC).

Texas–Rio Grande Valley Vaqueros baseball: The Texas–Rio Grande Valley Vaqueros baseball team, or the UTRGV Vaqueros, is the varsity intercollegiate baseball team of the University of Texas Rio Grande Valley, an NCAA Division I institution with several campuses in the Rio Grande Valley of South Texas.  UTRGV was formally founded in 2013 with the announced merger of the University of Texas–Pan American (UTPA), with its main campus in Edinburg, and the University of Texas at Brownsville (UTB) in Brownsville, with the merged university beginning operation in the 2015–16 school year.  The Vaqueros compete in the Western Athletic Conference (WAC), play home games at UTRGV Baseball Stadium in Edinburg, and are coached by Manny Mantrana.

Northeastern University: Northeastern University (NU, formerly NEU) is a private research university in Boston, Massachusetts, established in 1898.  It is categorized as an R1 institution (Doctoral Universities: Highest Research Activity) by the Carnegie Classification of Institutions of Higher Education.

Jacksonville State Gamecocks baseball: The Jacksonville State Gamecocks baseball team is a varsity intercollegiate athletic team of Jacksonville State University in Jacksonville, Alabama, United States.  The team is a member of the Ohio Valley Conference, which is part of the National Collegiate Athletic Association's Division I.  The team plays its home games at Rudy Abbott Field in Jacksonville, Alabama.  The Gamecocks are coached by Jim Case.

George Mason University: George Mason University (Mason) is the largest public research university in the U.S. state of Virginia.  The university was founded as a branch of the University of Virginia in 1949 and became an independent institution in 1972.  Four campuses are located in Virginia, with another in Songdo, South Korea inside the Incheon Free Economic Zone.  Three of the four campuses within Virginia are within the Northern Virginia section of the Piedmont, and one is in the Blue Ridge Mountains region.  On-campus housing options exist at all campus locations except Arlington.  The university recognizes 500 student groups as well as 41 fraternities and sororities.  Today, the Carnegie Classification of Institutions of Higher Education R1 research institution is recognized for its programs in economics, law, creative writing, computer science, and business.  Mason faculty have twice won the Nobel Memorial Prize in Economics.

Supporting paragraphs: Rudy Keeling Northeastern University
Answer: Northeastern University