Graduate of Marquette University’s History Department. He taught in the University of Wisconsin Colleges from 1995 to 2009, pioneering its online offerings in United States and World History. In 2002, Leahy he published an award winning biography of Milwaukee Representative Clement J. Zablocki. From 2009 to 2011, he taught at the American University in Bosnia and Herzegovina. Since 2011, he has taught at Shantou University. He has also held leadership positions in the Polish American Historical Association.

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