Justin has given speeches, presentations, and keynote addresses at leading universities, think tanks, corporations, government agencies, international institutions, and public venues, spanning audiences from North America, Latin America, Europe, Africa, Oceania, and Asia.

These include speeches, presentations, or keynote addresses at the White House and US government agencies; the United Nations and NATO; the Reuters Global Market Forum, the American National Standards Institute, and the International Monetary Fund; and the Cold War Museum, the Consumer Federation of America, the UK National Association of Data Protection Officers, and the National Press Club. Frequently covered topics include cybersecurity, data brokers, data privacy, artificial intelligence (AI), India, China, Russia, the future of the internet, the history and politics of surveillance, and technology geopolitics.