Simon Walker is a seasoned human rights lawyer and international civil servant. He currently serves as Chief of the Rule of Law and Democracy Section at the Office of the High Commissioner for Human Rights (OHCHR), where he leads a team of experts working on a broad range of issues, including the administration of justice, counter-terrorism and human rights, the abolition of the death penalty, drug policy and human rights, conditions of detention, media freedom and the safety of journalists, democracy, transitional justice, and human rights in armed conflict.

Previously, he served as Chief of Section One in the Human Rights Treaties Branch (2011–January 2022) and as Representative of the OHCHR in Cambodia.