William Clark is a man that has been overlooked in history. While Clark had many accomplishments in his life, most have been overlooked because of an expedition that he was a leader on, the Lewis and Clark expedition. Clark was a military man by profession. His older brother George Rogers Clark had been a decorated general during the American Revolution, and William had always been in his shadow. William was personally asked by Thomas Jefferson to be a part of an expedition of the West, Clark accepted.