William Elliott Butler (born 20 October 1939) was a jurist and educator at the John Edward Fowler Distinguished Professor of Law, Dickinson School of Law, Pennsylvania State University (2005-) and Professorial Research Associate, School of Oriental and African Studies, the University of London (2006-), and Emeritus Professor of Comparative Law in the University of London (2005-). He was an authority on the legal systems of Russia, other members of the Commonwealth of Independent States (CIS), and Mongolia. He was also involved in the fields of public and private international law. He is currently 83 years old and has written 4 books about the Russian Law. Butler is a bibliophile and bookplate collector. Source: Wikipedia (en)