Rabbi Jacob Herzog was an Orthodox Rabbi, lawyer and doctor of international law, Herzog was a member of Haganah intelligence during the British Mandate. Herzog held a number of government posts, including Ambassador to Canada, assistant director general of the foreign ministry and director-general of the Prime Minister's office.
Sources: Bard, Mitchell G. and Moshe Schwartz. 1001 Facts Everyone Should Know About Israel. Rowman & Littlefield Publishers, 2005.