Law practice since 1975 as partner in a number of law firms. Admitted to the District Court of Iceland (hdl.) in 1977 and the Supreme Court (hrl.) in 1982. Also from January 1, 1995 to December 31,1999 Managing Director of the patent bureau Árnason & Co. Ltd.
Lecturer on Corporate- and Finance Law at the University of Iceland, Faculty of Economics 1977-1981.
External Examiner on General Jurisprudence and Legal History at University of Iceland, Law Faculty 1984.-2002.
Lecturer on Securities Law and Regulations at courses held by the Ministry of Finance for the Securities Brokerage Diploma 1991-1995.
Lecturer on Business Law and International Business Law, Reykjavik University, School of Business 1999-2001, Assistant Professor from April 1, 1999 and Associate Professor from October 1, 2000 - February 5, 2002.
Dean of Reykjavik University School of Law from February 5, 2002 to December 31, 2010.
Member of Reykjavik University Executive Committee from February 5, 2002 to December 31, 2010.
District Court Judge, Reykjavik District Court, since April 1, 2011.