The nature of the group was to change significantly with the move to Birmingham in 1765 of the Scottish physician William Small, who had been Professor of Natural Philosophy at The College of William & Mary in Williamsburg, Virginia. There he had taught and been a major influence over Thomas Jefferson, and had formed the focus of a local group of intellectuals. His arrival with a letter of introduction to Matthew Boulton from Benjamin Franklin was to have a galvanising effect on the existing circle, which began to explicitly identify itself as a group and actively started to attract new members.