Former U.S. Presidents Theodore Roosevelt and Franklin Delano Roosevelt attended the law school. Other political figures educated at Columbia include former U.S President Barack Obama, Associate Justice of the U.S. Supreme Court Ruth Bader Ginsburg, former U.S. Secretary of State Madeleine Albright, former chairman of the U.S. Federal Reserve Bank Alan Greenspan, U.S. Attorney General Eric Holder, and U.S. Solicitor General Donald Verrilli Jr. Dwight D. Eisenhower served as the thirteenth president of Columbia University from 1948 to 1953. The university has also educated 26 foreign heads of state, including president of Georgia Mikheil Saakashvili, president of East Timor Jose Ramos Horta, president of Estonia Toomas Hendrik Ilves and other historical figures such as Wellington Koo, Radovan Karadžić, Gaston Eyskens, and T. V. Soong. The author of India's constitution Dr. B. R. Ambedkar was also an alumnus of Columbia.