John Donald MacArthur was an American insurance magnate, real estate investor and philanthropist who established the John D. and Catherine T. MacArthur Foundation, benefactor in the MacArthur Fellowships.

Sir Harry Oakes, 1st Baronet was a British gold mine owner, entrepreneur, investor and philanthropist. He earned his fortune in Canada and moved to the Bahamas in the 1930s for tax purposes. Though American by birth, he became a British citizen and was granted the hereditary title of baronet in 1939.