[8] In 1980, Haresco completed an Aquaculture Productivity and Management Course (APDEM) organized by the Southeast Asian Fisheries Development Center (SEAFDEC) at the University of the Philippines Diliman in Quezon City.

[10] In 1975, Haresco also worked as a Project Economist at the Agriculture Section II of the UNCTAD-ITC at the International Trade Center in Geneva, Switzerland.

Haresco ran in Congress for Second District of Aklan against Anita Victoria Ramos-Antonino, daughter of Former Congressman Godofredo Ramos.

[12] As a congressman, Haresco's policy focus is the promotion of MSMEs (Micro Small and Medium Enterprises) as a way to uplift the Filipino from poverty.

[13] One of the major challenges in his political career was in 2014 when Haresco was falsely accused of issuing fake Special Allotment Release Orders forms (SARO).