Atty.Rainier Mamañgun

Atty. Rainier Mamangun

Lawyer's Profile

Atty. Rainier R. Mamaňgun, formerly a lawyer for the Philippine Department of Foreign Affairs, DFA, worked on labor, civil and criminal cases involving migrant workers and overseas Filipinos in distress. In this connection, he spearheaded various legal missions abroad to such countries as Malaysia, Indonesia, East Timor, Nepal, India, and Saudi Arabia. His work involved diplomatic representations with foreign governments as well as appearances before a foreign court. During his stint with the DFA, he was instrumental in rescuing countless victims of human smuggling and trafficking and in saving the lives of Filipinos on death row abroad.

 Prior to this, Atty. Mamaňgun worked as a legal consultant to the National Federation of Labor Unions, NAFLU, one of the biggest labor federations in the Philippines.

In 2003, he was chosen by the Office of the Vice-President of the Philippines to be part of the Drafting Committee composed of distinguished professors of the University of the Philippines Law Faculty and representatives from concerned government agencies to draft the "Magna Carta for Seafarers"-- a bill that aims to promote the welfare of millions of Filipino seafarers worldwide.

His experience in dealing with OFW concerns and involvement in the labor movement made him adept at tackling civil, criminal, immigration and labor matters.

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Bar Admission

Atty. Rainier R. Mamangun was admitted to the Philippine Bar in 2001.



Atty. Mamaňgun is a member in good standing of the Integrated Bar of the Philippines. He belongs to the pool of lawyers par excellence of the Fraternal Order of Utopia - an academic organization based at the Ateneo Law School. He renders free legal service to indigent OFWs and their families as a volunteer lawyer for the Kanlungan Centre Foundation. He is also a member of Singles for Christ - a Catholic group composed of individuals committed to living a life in Christ. He was also member of U.P. HARIBON - an organization dedicated to the protection of the environment.


Languages : English & Filipino


Lawyer's Areas of Practice

Adoption, Child Support & Custody, Divorce, Estate & Trust, Family Law, Immigration, Separation, Will



Professional Experience

Atty. Mamaňgun is adept at handling cases in and out of court. His training with the Philippine Department of Foreign Affairs enabled him to hone his diplomatic skills which now prove crucial in his dealings and negotiations with the court and the opposition. His skills at legal drafting and the defense of existing legislation were developed through years of service at the Office for Migrant Workers Affairs and in appearances at Congressional hearings and various inter-agency meetings that dealt with law and policy formulation. He had, for instance, defended the constitutionality of the "Migrant Workers' Act" before the Regional Trial Court and the Court of Appeals, in coordination with the Office of the Solicitor General.



Atty. Mamangun's work on "The Policies and Laws Governing Filipino Seafarers," co-authored by Dean Merlin Magallona, was published in in 2003 in the official organ of the University of the Philippines College of Law. He likewise authored the article entitled "Comparative Analysis of the Philippine Arbitration Law and the UNCITRAL Model Law on International Commercial Arbitration (Part I)" published at Hieros Gamos.


Past Employment Positions 

Atty. Mamaňgun served for three years as lawyer for the Philippine Department of Foreign Affairs - Office of the Undersecretary for Migrant Workers Affairs, OUMWA, wherein he was Acting Head of the Asia & the Pacific Desk as well as the Seafarers' Desk. Atty. Mamaňgun was sent by DFA to Malaysia to handle the growing problem of human trafficking and illegal recruitment which victimized thousands of Filipino women. He undertook a covert operation to rescue four Filipinas from a sex syndicate in the remote island of Labuan. He also negotiated with Malaysian authorities for the humane and orderly repatriation of thousands of Filipinos from Sabah during the mass deportation in 2002. He also went on a legal mission to Dili, East Timor to help our compatriots who were victimized by illegal recruiters. Atty. Mamangun was likewise sent by the DFA on two occasions to Nepal and Saudi Arabia to head a legal team in an attempt to stay the execution of a Filipino wrongly accused of murder. Efforts at diplomacy and astute legal maneuverings proved successful as the accused is now back with his family in the Philippines.



It was at the University of the Philippines where Atty. Rainier Mamaňgun took up his bachelor's degree in Political Science as a "Iskolar ng Bayan," or State Scholar. He was a consistent College Scholar and University Scholar at the said University. He served as the Deputy Academic Chairman of the Fraternal Order of Utopia in SY1997-1998 at the Ateneo Law School. In high school, he graduated with honors at the Don Bosco Technical College and was the recipient of the coveted St. Dominic Savio Award for excellence in conduct. He was class valedictorian in grade school and a Leadership Awardee - a distinction given to the most promising youth leaders of the country.

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