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Dr. Fredrick D. RossiniTRC Director, 1942-1961
Dr. Kenneth N. Marsh, TRC Director, 1985-1997
Dr. Bruno ZwolinskiDirector, 1961-1979
Dr. Michael FrenkelTRC Director, 2000-2014
Dr. Kenneth R. Hall, TRC Director, 1979-1985; 1997-2000