Sir Thomas Boverton Redwood (1846–1919) stands as a giant in the history of petroleum science and technology. This paper pieces together scattered information about his life and work, and discusses his contributions, directly or indirectly, to petroleum exploration and production in various parts of the world, especially Burma (Myanmar), Persia, Mexico and the West Indies with which British colonial and commercial interests were related. Redwood established one of the first and most successful consulting firms for petroleum companies, and, in this way, trained generations of petroleum geologists and engineers. His masterpiece, Petroleum: A Treatise, which went through five editions from 1896 to 1926, summed up the knowledge of petroleum of its age, and still remains a valuable book for historical reference. Redwood’s mediatory position between scientific, industrial and political circles in Britain enabled him to play a leading role in the development of petroleum technology, as well as Britain’s oil operations around the world during the 1880s–1910s. He served as a technical advisor to many government committees and oil companies, and his total dedication to Britain’s oil security during World War I and during the transformation of the Royal Navy’s fleet from coal to oil fuel were the climax of his professional life.