Independent Director since 2015, Professional Services, Inc.; Chancellor, University of the Philippines (UP), Diliman (appointed 2014); Professor XII, College of Social Sciences and Medicine; Clinical Professor, UP College of Medicine. He is a medical anthropologist. Dr. Tan has been allowed by the University of the Philippines to engage in limited practice of profession or involvement in outside activities for the period AY 2018-2019 as approved by its Executive Vice-President, Mr. Teodoro J. Herbosa on April 10, 2019.