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From Wikipedia:
Legal career
From 2002 to 2008, AnÄić was a law student at the University of Split; he graduated from its law school on 14 April 2008, with a thesis entitled "ATP Yesterday, Today and Tomorrow", describing the legal foundation and organization of the ATP Tour.
Illness forced AnÄić to be off courts in much of the 2009 tennis season, and he started his residency in the law office of Turudić in Zagreb; but he announced he would freeze his residency for some time due to his tennis career. In 2009, he spent several months at Harvard Law School on a research project under Peter Carfagna, an adjunct professor who had previously been the top lawyer at sports management giant IMG. During his time at Harvard Law, he spoke twice at the school—the first about his law and tennis experiences, and the second time about doping cases in tennis. AnÄić completed his project with a paper on the legal aspects of doping in tennis which Carfagna considered to be publication quality. After his experience at Harvard Law, he decided to pursue a master's degree, and enrolled in 2012 at Columbia Law School. In a 2012 interview, AnÄić indicated that he might stay in New York City to work in corporate law before returning to Croatia. In May 2013, he was appointed to a job in the legal department of the National Basketball Association.