14 Mar. 1811–1 Feb. 1878. Physician, land speculator. Born in Braunston, Northamptonshire, England. Son of John Foster and Jane Knibb. Married Sarah Phinney, 18 July 1837, at Medina Co., Ohio. Baptized into LDS church, before Oct. 1839. Ordained an elder, Oct. 1839, in Nauvoo, Hancock Co., Illinois. Instructed in JS revelation to buy stock for building Nauvoo House, 19 Jan. 1841. Appointed surgeon general in Nauvoo Legion, Mar. 1841. Regent of University of Nauvoo, 1841–1844. Member of Nauvoo Masonic Lodge. Appointed to serve mission to Tioga Co., New York, 10 Apr. 1843. Excommunicated, 18 Apr. 1844, in Nauvoo. Cashiered from Nauvoo Legion, May 1844. Publisher of Nauvoo Expositor. Appointed apostle in William Law’s schismatic church, and actively worked against JS until JS’s martyrdom. Identified by Willard Richards as member of mob that killed JS and Hyrum Smith, 1844, at Carthage, Hancock Co. Moved to Canandaigua, Ontario Co., New York, by 1850. Moved to Loda, Iroquois Co., Illinois, by 1859. Died in Loda.