He was able to lobby for government funds to expand the carrying capacity of the College of Medicine and establishment of the Modern Skills Laboratory for medical students through legislated government appropriations. 

He has served as the editor-in-chief of the WVSU Journal of Medical Studies and the OIC Chair of the COM Office of Research. 

One of Dr. Villaruz’s career highlight, however, was his appointment as OIC President from November 2013 to May 2014. During his seemingly short stint as university president, he has left a remarkable legacy in managing the affairs of the university. In 2019 he was appointed 8th President of WVSU. He jumpstarted the University’s vision to become a research university and has achieved research milestones over the past four years as well as improving the WVSU national and international rankings in research productivity. He also initiated the WVSU Internationalization Program.

In 2012 he was invited by the Commission on Higher Education to be a member of the Technical Committee for Medical Education, an appointment he kept until May of 2021. To date, one of his greatest contributions to medical education in the country involved his participation in the crafting and formulation of the policies, standards, and guidelines for the Doctor of Medicine Program (2016). In June 2022, he was appointed Chair of the Technical Panel for Medical Education (TPME). As the TPME Chair, his role was pivotal in leading the implementation of RA 11509 “Doktor Para Bayan Law” through assessment and recommendation to the CHED en banc for approval the application of new medical programs by State Universities and Colleges. As the Chair of the TPME, he also sits as the adviser to the CHED Chairman in the awarding of grants to existing and new medical schools for facilities and laboratory modernization. He currently leads the TPME in the formulation of the SMART MD Roadmap for the Philippines with Universal Healthcare (UHC) as a backdrop as well as led the TPME in formulating the CHED- approved Accelerated Pathway for Medicine (APMed), a shortened program for Medicine set to be implemented in AY 2024-2025.

He was appointed National President of the Association of Philippine Medical Colleges (APMC) for two consecutive terms (2015 and 2016). He initiated institutional reforms that included the automation of the National Internship Program for medical graduates, the release of APMC Journal’s maiden issue, and actively assisted medical schools in the curricular transition to outcome-based education during his term. He is a member of the APMC Post-graduate Internship Committee since 2017 and has contributed to the formulation of the policies, standards and guidelines for the National Internship Program.