* The Sri Lankan Civil War: He has written extensively about the civil war, its impact on civilians, and the role of the government and the Tamil Tigers. He has also published research on the use of torture and human rights abuses during the war.
* Post-War Sri Lanka: He has also written about the post-war period, including the government's response to the war, the challenges of reconciliation, and the ongoing human rights issues.
* Technology and its impact: He has published on the role of technology in conflict, including social media, surveillance, and cyberwarfare. He also writes about the impact of technology on democracy and freedom of speech.
* Media and Journalism: He is a strong advocate for freedom of the press and has written about the challenges faced by journalists in Sri Lanka.
Some of his most notable publications include:
* "The Anatomy of a Massacre: The Human Cost of the Sri Lankan Civil War" (2015)
* "The Death of a Nation: Sri Lanka's Lost War" (2016)
* "The Sri Lankan Civil War: A Photographic History" (2017)
* "Sri Lanka's Post-War Transition: Challenges and Opportunities" (2018)
* "The Rise of Digital Authoritarianism: The Sri Lankan Case" (2019)
He has also written numerous articles for various international publications, including The Guardian, The New York Times, and Al Jazeera.
Note: It is important to note that some of the information provided may be based on public information and may not be exhaustive. It is recommended to consult Sanjana Hattotuwa's official website or other credible sources for more information about his work.