Justice Santiago is an Independent Director of Top Frontier Investment Holdings, Inc. (since 2013), the Chairperson of the Corporate Governance Committee (since 2013) and of the Related Party Transaction Committee (since 2017), and a member of the Audit and Risk Oversight Committee (since 2017). She was a member of the Audit Committee and the Executive Compensation Committee (2013-2017). She is also an Independent Director of SMC Global Power Holdings Corp. (since 2011), Anchor Insurance Brokerage Corporation (since 2012), South Luzon Tollway Corporation (since 2015) and Phoenix Petroleum Phil. Inc. (since 2013). She was formerly an Associate Justice of the Supreme Court (1999-2009), an Associate Justice of the Court of Appeals (1990-1999), and a Regional Trial Court Judge of Makati City (1986-1990). Justice Santiago obtained her Bachelor of Laws degree from the University of the Philippines, College of Law.