ペンシルベニア植民地
Shippen was appointed to a one-year term by William Penn in 1701. In 1702, he was elected to a second one-year term, making him the first elected mayor of Philadelphia. He was also a leader of the Province of Pennsylvania, and served as Chief Justice of the Supreme Court of Pennsylvania in 1699. He also served as the chief executive for the Province of Pennsylvania as the President of the Provincial Council between 1703 and 1704.