Professor Jack-Osimiri was the Dean of Law RSU, 2003-2007; Foundation Dean of Law, Ebonyi State University, Abakaliki (2000-2003); Formerly Head of Department of Private Law University of Ado-Ekiti (1998-2000); Visiting Professor of Taxation & Business Law, Joint Tax Board Inspectors of Taxes Training School Lokoja, Akwanga and Kaduna Study Centres (2001-2008)