He writes regularly for The Guardian[3] and serves on the board of Amnesty International USA[4] and of the Corporate Europe Observatory[5] Previously he was a producer and radio host at KPFA-FM in Berkeley, California,[6] and a visiting fellow at the Center for American Progress[7] Chatterjee has also served as a community advisor to KQED, the San Francisco public radio and television station.

[12] Chatterjee has travelled extensively in Central Asia and the Middle East to investigate the role of private military contractors working in Afghanistan and Iraq.

[13] His footage was used in Michael Moore's 2004 film Fahrenheit 9-11 and he was interviewed in Robert Greenwald's film Iraq for Sale: The War Profiteers[14] In February 2009, Chatterjee published a detailed history of the role of Texas companies Halliburton and KBR titled Halliburton's Army: How A Well-Connected Texas Oil Company Revolutionized The Way America Makes War (Nation Books).

[16] He followed this up with an article on the poor treatment of Afghan translators working under contract with Ohio-based Mission Essential Personnel for the US military.

[17] In 2017, Chatterjee published Verax: The True History of Whistleblowers, Drone Warfare, and Mass Surveillance in collaboration with graphic novelist Khalil Bendib.