Gus has worked at the intersection of technology and human rights for over twenty years. He developed national, regional, and global campaigns on communications privacy. He worked on national security and anti-terrorism policy, and led global advocacy against border registration, biometric collection, tracking of migration, travel profiling, and mass surveillance of financial data flows. He led research and co-authored a book on identity systems and policy, Global Challenges for Identity Policy. He founded regional and global networks of civil society organisations to work on technology and rights. He has acted as an external evaluator for UNHCR, advised the UN Special Rapporteur on Terrorism and Human Rights, and has advised a number of other international organisations. Gus is a Fellow of the Royal Society for the encouragement of Arts, Manufactures and Commerce (FRSA).