Refer to the passage below and then answer the question afterwards in the same language as the passage:

Passage: Tsai studied law and international trade, and later became a law professor at Soochow University School of Law and National Chengchi University after earning an LLB from National Taiwan University, an LLM from Cornell Law School and a Ph.D. in law from the London School of Economics and Political Science. In 1993, as an independent (without party affiliation), she was appointed to a series of governmental positions, including trade negotiator for WTO affairs, by the then-ruling Kuomintang (KMT) and was one of the chief drafters of the special state-to-state relations doctrine of then President Lee Teng-hui.

Question: What educational institution did Tsai receive his doctorate from?
London School of Economics and Political Science