James J. McGillan (1941-2013) was a lawyer and businessman who specialized in corporate transactions and telecommunications systems. He was co-founder of Private Transatlantic Telecommunications System, Inc. (PTAT), which constructed the first privately owned transatlantic fiber optic telecommunications cable from the United States and England. Later, he was co-founder of Med-Tel International Corp., which operated Magnetic Resonance Imaging (MRI) clinics in the U.S. and United Kingdom. McGillan's papers largely include the corporate records of both PTAT and Med-Tel International, documenting corporate buyout policies and transactions, high level executive and managerial decision making, federal licensing, and corporate law within the telecommunications industry.