Missionary to Tibet; born William Ekvall Simpson on October 19, 1901 in Old Orchard, Maine, USA to William Wallace and Alma Maria Otilia (Ekvall) Simpson, missionaries to China, first with the Christian and Missionary Alliance (C&MA) and then with the Assemblies of God (AOG). Siblings: Margaret Helene (Simpson) Jamieson and Louise Matina (Simpson) Chenoweth. Simpson converted to Christianity at the age of 10; homeschooled until the age of 13. In 1915, he attended an academy in Tennessee while his family was back in the United States on furlough; 1917, he attended and graduated from Bethel Bible Training School in Newark, New Jersey, USA, where his father was principal. Simpson received formal appointment as an AOG missionary on December 4, 1923, although he had been one informally since 1919. From 1918-1932, he traveled among Tibetan nomadic herdsman in the general area of Labrang, Tibet, sharing the gospel with them. He pioneered many uncharted paths in the area, and at the time of his death had trained and supported eight Chinese evangelists who were also working in the area. Simpson was killed by army deserters at Shih Keo Waunao in Kansu Province, China on June 20, 1932.