 As co-chair of the Permanent Standing Committee on Human Rights in Sri Lanka, Samarasinghe works in close cooperation with several UN Organisations including the United Nations Human Rights Commission (UNHRC), United Nations Development Programme, United Nations Children's Fund (UNICEF) and International Labour Organization, as well as other international organizations such as the International Organisation for Migration to continue Sri Lanka's endeavors to rehabilitate and reintegrate citizens from the country's formerly war-torn areas.He also acted as a member of the Advisory Committee to the Human rights task force of sri lanka while being the Executive member of the parliamentary group for the protection and promotion of human rights.Samarasinghe entered active politics in 1988 and was elected to the Provincial Council of the Western Province, where he served as the Leader of the House of the Provincial Council and the Provincial Minister of Health and Economic Infrastructure.