As one of only twelve UN country-specific mandate holders, and as the longest-serving UN Special Rapporteur for Human Rights in Cambodia, my work has had a significant impact on the situation of human rights in that country, with many of my recommendations having been implemented by the government. The Parliament of Cambodia has enacted three fundamental laws designed to enhance the independence and capacity of the judiciary, and has amended the Constitution of the country to make the National Election Commission a constitutional, independent, and autonomous body, in line with my recommendations. In this paper I examine the role of the UN country-specific mandate holders, the approach that I took to implement my mandate in Cambodia, and the impact of my work in that country.