"James Churchward (February 27, 1851 - January 4, 1936) is best known as a British born occult writer. However, he was also a patented inventor, engineer, and expert fisherman.
He was the elder brother of the Masonic author Albert Churchward (1852-1925). He was a tea planter in Sri Lanka before coming to the US in the 1890s. In James' biography entitled My Friend Churchey and His Sunken Continent, he discussed Mu with Augustus LePlongeon and his wife in the 1890s. He patented NCV Steel, armor plating to protect ships during World War I, and other steel alloys. After a patent-infringement settlement in 1914, James retired to his 7+ acre estate on Lake Wononskopomuc in Lakeville, Connecticut, to answer the questions from his Pacific travels. In 1926, at the age of 75, he published The Lost Continent of Mu: Motherland of Man, which he claimed proved the existence of a lost continent, called Mu, in the Pacific Ocean."
Source: Wikipedia, "James Churchward", available under the CC-BY-SA License.