 From 1992-96, Hertell was managing director for the Caribbean and Latin America affairs at "Black, Kelly, Scruggs & Healey", a government and public affairs company based in Washington, D.C.In 1989, he served as a member of the Commission to Review U.S. Magistrates for Reappointment of the U.S. District Court for the District of Puerto Rico.Between 1982-84, he served as political and legal advisor to the Governor of Puerto Rico, as well as to the Attorney General, the Secretary of Agriculture and the Secretary of the Treasury of the Commonwealth of Puerto Rico.