He served as Chairman of the Securities and Exchange Commission from 1981 to 1986. He was appointed at a time when there was a growing popular clamor to protect the investing public from fraud and manipulation due to the shortcomings of the investment regulatory system.
His career in legal scholarship and practice includes a number of dissertations on various aspects of law. Among his scholarly works are:
- “The Tariff as an Instrument of National Policy” International Taxation Seminar, Harvard Law School, 1959.
- “The Reorganization of the Denver and Rio Grande Western Railroad Company”, Financial Reorganization Seminar, University of Michigan Law School, 1960.
- “Corporate Reorganization Under the Proposed Corporation Code”, Legal Management Council of the Philippines – UP Law Center Seminar on Corporation Law Reform, 1978.
- “Domestic and Offshore Financing and Syndicated Loans”, (co-authored with Gabriel C. Singson), General Assembly, ASEAN Law Association, 1980.
Mr. Abello ranked first among the successful examinees of the 1958 Bar Examinations.
Mr. Abello was an active member of the ASEAN Law Association, the Manila Junior Chamber of Commerce, the Philippine Jaycee Senate, and the Philippine Numismatic and Antiquarian Society.
He passed away in 2002.