Professor Ku's primary research interest is the relationship of international law to national law, both in the public and the private sphere. Most of his research has focused on the United States, but he also conducts research into China. He is a member of the American Law Institute.
Before joining the Hofstra Law faculty in 2002, Professor Ku served as a law clerk to Judge Jerry Smith of the U.S. Court of Appeals for the Fifth Circuit, and as an Olin Fellow and Lecturer in Law at the University of Virginia Law School. Professor Ku also practiced as an associate at the New York City law firm of Debevoise & Plimpton, specializing in litigation and arbitration arising out of international disputes. He has also been a visiting professor at the College of William & Mary Marshall-Wythe School of Law in Williamsburg, Virginia, and a Fulbright Distinguished Lecturer in Law at East China University of Political Science and Law in Shanghai, China.