Sujit Sivasundaram was born and educated in Sri Lanka (in 'Sinhala medium' until 1992) and came to Cambridge in 1994 to study engineering and then natural sciences and history and philosophy of science. In 2008-10 he taught at the London School of Economics in South Asian and Imperial History. In 2012 he was awarded a Philip Leverhulme Prize for History. He has been a Visiting Professor at the Ecole des Hautes Etudes en Sciences Sociales (EHESS), Paris; a Visiting Senior Research Fellow at the Asia Research Institute of the National University of Singapore and the University of Sydney. He was the Sackler Caird Fellow, 2015-7, at the National Maritime Museum, Greenwich. He is a Councillor of the Royal Historical Society.

Sujit Sivasundaram has worked primarily on the late-eighteenth and early-nineteenth centuries in the Indian and Pacific oceans, with a special emphasis on South and Southeast Asia and Polynesia. His research is thus grounded in two separate regions set apart from each other by about eight thousand miles. He has worked thematically on the intersection of empires and globalisation with the environment, culture, technology, anthropology, science and medicine. He has published edited work on primary sources in the history of race. His writings have intervened in maritime and oceanic history. Through separate research projects he is developing methods for world histories alongside and within 'area studies', to help reconsider processes of bordering - eg. by focusing on islands (and the phenomenon of 'islanding'). His earlier work on Christian missionaries and scientific knowledge has led on to a focus on material culture - and in particular the layering of different materialities (eg. oral/print, genealogical/historical) in the rise of History as a world discipline. He has also worked on the complex of the human and animal in colonial contexts (eg. elephants, 'wolf children').

His book for Harper Collins, 'Waves Across the South', will appear in 2020 and links the British empire and the age of revolutions in the oceans of the global South - the Indian and Pacific seas. Foregrounded here are the Tasman Sea, the Bay of Bengal, the Persian Gulf, Polynesia, and the Southwest Indian Ocean. The book tracks a maritime patriotism of the British Empire as it overtook the pulses - connected to culture, knowledge, trade and religion - which spanned the seas before it. He has worked in archives across the Indian and Pacific oceans for this project.

For Cambridge University Press, he is editing an account of where the global turn has taken the discipline of the history of science, tentatively titled, Histories of the Sciences: Globe, Area, Empire, Nation and Beyond.

Recent papers and lectures include: the 2018 Fennell Lecture at the University of Edinburgh; a keynote to the International Congress of the History of Science in Rio, Brazil and a keynote in Brisbane, Australia to the David Nichol Smith Seminar. In 2019, he will deliver the Royal Historical Society's Prothero Lecture; and keynotes at the International Society of Cultural History conference in Estonia and the British Society for the History of Science Postgraduate Conference.

How did the British come to conquer South Asia in the late eighteenth and early nineteenth centuries? Answers to this question usually start in northern India, neglecting the dramatic events that marked Britain’s contemporaneous taking of the island of Sri Lanka. In Islanded, Sujit Sivasundaram reconsiders the arrival of British rule in South Asia as a dynamic and unfinished process of territorialisation and state building, revealing that the British rule in South Asia as a dynamic and unfinished process of territorialisation and state building, revealing that the British colonial project was framed by Sri Lanka’s traditions and maritime placement and built in part on the model they provided. Using palm-leaf manuscripts alongside the colonial archive, Sivasundaram tells the story of two sets of islanders in combat and collaboration. He explores how the British organized the process of ‘islanding’ and ‘partitioning’: they aimed to create a separable unit of colonial governace and trade in keeping with conceptions of ethnology, culture, and geography. The advent of British rule in South Asia was thus a critical point in the fragmentation of the mainland from the island. But rather than serving as a radical rupture, he reveals how the colonists recycled and constantly redefined traditions that they learned from Kandy, a kingdom in the Sri Lankan highlands whose customs—from the strategies of war to views of nature—fascinated them. Picking up a range of unusual themes, from migration, orientalism, and ethnography to botany, medicine, and education, Islanded is an engaging retelling of the advent of British rule and a theory of colonial impact that speaks to other places that have been lost from dominant histories.