A lawyer and a CPA by profession, Atty. Mercado is a member of the Board of Directors of several publicly-listed companies namely: Waterfront Philippines, Inc., Metro Alliance Holdings & Equities Corp., Forum Pacific, Inc., and Wellex Industries, Inc. He is currently the Vice-President for Legal Affairs of the Wellex Group, Inc. In the past as Deputy Administrator for Administration, he had supervised the largest group in the Subic Bay Metropolitan Authority (SBMA). He had also, helped in the drafting of Administrative Orders to effectively implement R.A. 7227 (the law creating the Subic Bay Freeport Zone) and its implementing rules and regulations. He was the President of Freeport Service Corporation, a subsidiary of SBMA and helped in the creation and organization of this service corporation. He is also a Director of Acesite (Phils.) Hotel Corporation since June 24, 2004-present. He studied BSC Major in Accountancy at the University of Santo Tomas and Bachelor of Laws (LLB) at the Ateneo de Manila University School of Law, graduated in 1985 and 1990, respectively. He has been a Director of Waterfront Philippines Inc., since July 2003-present.