Mamer J. Antonio

Mamer J. Antonio is the current Punong Barangay of Barangay Sinamar Sur in San Mateo, Isabela, Philippines, serving the 2023 - 2026 term. The position — also commonly referred to as Barangay Captain — is the elected head of the barangay's local government unit.

The Punong Barangay is the chief executive of the barangay, the smallest and most local unit of government in the Philippines. Duties under Section 389 of RA 7160 include enforcing barangay ordinances, organising and leading an emergency response team, calling and presiding over sessions of the Sangguniang Barangay, maintaining public order through the Lupong Tagapamayapa (peace council), and supervising the delivery of basic services to residents.

Barangay Sinamar Sur is one of 33 barangays in the municipality of San Mateo, in the province of Isabela, in the Cagayan Valley region of the Philippines. According to the 2020 Census of Population and Housing, Barangay Sinamar Sur had a population of 2,156 residents — the constituency that Mamer serves as Punong Barangay. Isabela is classified as a 1st by the Bureau of Local Government Finance.

Elected through the Barangay and Sangguniang Kabataan Elections, Mamer J. Antonio is serving the current four-year term established under Republic Act No. 12232, which extended the barangay official's term from three years to four. The next BSKE will be held on Monday, November 2, 2026, following COMELEC Resolution No. 11191.

As an elected Philippine public official, Mamer J. Antonio is accountable to the residents of Barangay Sinamar Sur and must comply with the Local Government Code of 1991 (RA 7160), the Code of Conduct and Ethical Standards for Public Officials and Employees (RA 6713), and other national laws. Barangay officials are required to file Statements of Assets, Liabilities and Net Worth (SALN) and are subject to the oversight of the Department of the Interior and Local Government and the Office of the Ombudsman.