Ellerbe Becket is an independent Minneapolis, Minnesota-based architectural, engineering, interior design and construction firm until 2009, when it was acquired by AECOM. AECOM is ranked as one of the world's largest architectural firms, with offices in Dallas, TX, Kansas City, MO, San Francisco, CA, Washington, DC, Dubai, United Arab Emirates and Doha, Qatar. The firm currently employs 475 people in seven locations and three countries, and has designed buildings in all of the 50 states and in 20 countries. History The company originally called Ellerbe & Co. was founded by Franklin Ellerbe in 1909 in St. Paul, Minnesota. Its first clients included the Mayo Clinic and 3M. Thomas Ellerbe took over the company in 1921 upon his father's death. When he retired in 1966 it became an employee-owned company. In 1988 it merged with Welton Becket and Associates of Los Angeles and became Ellerbe Becket. In 1988 it opened a sports design division in Kansas City. On October 26, 2009 Ellerbe Becket joined the architecture, planning, and engineering firm AECOM. Projects General buildings Ronald Reagan Building, Washington, DC Carlson School of Management - University of Minnesota, Minneapolis, MN Kingdom Centre, Riyadh, Saudi Arabia Target Plaza South and North, Minneapolis, MN Science Museum of Minnesota St. Paul, MN Brasil Telecom Data Center, Brasilia, Brazil Charles Evans Whittaker Federal Courthouse, Kansas City, MO Hesburgh Library, 1963 O'Shaughnessy Hall (1953), North Dining Hall (1957), Keenan Hall and Stanford Hall (1957), Stepan Center (1962), Lewis Hall (1965), Galvin Life Science (1967), Grace and Flanner Halls (1969), Fitzpatrick Hall of Engineering (1974), Snite Museum of Art (1980), Pasquerilla West (1980), Pasquerilla East (1981), Stepan Chemistry Hall (1982), Decio Faculty Hall (1984), Siegfried Hall (1988), Knott Hall (1988), Pasquerilla Center (1990), Ricci Band Building (1990), Hesburgh Center for International Studies (1991), DeBartolo Hall (1992), Mendoza College of Business (1996), O'Neill Hall (1996), Keough Hall (1996), McGlinn Hall (1997), Welsh Family Hall (1997) at the University of Notre Dame Health care Yonsei University Medical Center - Severance Hospital, Seoul, Korea Khalifa Sport City - Orthopedic Sports Medicine Hospital, Doha, Qatar This is now Aspetar Walt Disney Memorial Cancer Institute, Orlando, FL Mercy Medical Center, Baltimore, MD Mayo Clinic, Rochester, MN Sanford Health, Sioux Falls, SD St. Luke's Hospital Nassif Heart Center, Cedar Rapids, IA St. Rita's Medical Center, Lima, OH Stonewall Jackson Hospital, Lexington, VA Gonda Building, Rochester, MN Regions Hospital (2009 expansion & cafeteria renovation), St.