He earned a bachelors degree in law from the Universidad Nacional Autónoma de México and a Master in International Human Rights Law from the University of Notre Dame. He's also certified in human rights and democratization processes from the Universidad de Chile and holds a degree in access to justice from the Universidad Iberoamericana.
Sánchez served as lawyer, associate, and executive director of the Comisión Mexicana de Defensa y Promoción de los Derechos Humanos. He founded and led the organization i(dh)eas, an NGO focused on strategic human rights litigation. He served as consultant for Mexican and international institutions such as the Centro de Investigación y Docencia Económicas (CIDE), the Human Rights Commission of the Federal District, the World Bank, the Office of the High Commissioner for Human Rights (OHCHR) in Mexico, the International Center for Transitional Justice (ICTJ), and the Organization of American States (OAS). Sánchez Matus is also author, co-author and coordinator of publications on human rights, such as Experiencia de México ante la Comisión Interamericana de Derechos Humanos, and El Litigio Estratégico en México: la Aplicación de los Derechos Humanos a Nivel Práctico. He served as lecturer in the Law department at the Instituto Tecnológico de Monterrey and cooperating lawyer at the International Human Rights Clinique at George Washington University. Sánchez Matus' work has been funded by a Fulbright Fellowship at the American University Washington College of Law, a fellowship from the University of Notre Dame at the InterAmerican Commission on Human Rights, and an Ashoka fellowship.