Admiral Sir John Fisher (1841-1920) was a prominent British naval officer known for his significant reforms in the Royal Navy. He served as First Sea Lord from 1904 to 1910, where he introduced modern naval strategies and technologies, including the development of the dreadnought battleship, which revolutionized naval warfare. Fisher's leadership during a time of rapid change in naval power helped position Britain as a dominant maritime force. His emphasis on speed and firepower influenced naval tactics and ship design, making him a key figure in the history of the Royal Navy and modern military strategy.