Pierluisi Diaz was started as a lieutenant in the
United States Army. He worked as a construction inspection, chief inspector, and civil engineer in the Design Department of the Army Antilles Engineers, part of the
United States Army Corps of Engineers. He became a general contractor and developer who constructed hospitals, hotels, housing, industrial buildings, office buildings, and shopping centers in Puerto Rico. He was the
Secretary of Housing of Puerto Rico under the administration of Governor
Carlos Romero Barceló, between 1977 and 1984. He then became a mediator, and arbitrator and was a member of the Panel of Arbitrators of the
American Arbitration Association. Pierluisi Diaz was a president of the Puerto Rican chapter of the
Associated General Contractors of America, who awarded him the Alejandro Herrero Award. He also belonged to the Puerto Rican College of Engineers and Surveyors. == Personal life ==