George Johnson of Philadelphia, Pennsylvania

I am seeking information George Johnson, a free African who lived Philadelphia County, Pennsylvania. George Johnson was a member of the African Episcopal Church of St. Thomas in Philadelphia, Pennsylvania.George Johnson served on the Vestry of AECST in the early 19th century.

George Johnson and his wife, Esther, presented their three children to the Rev. Absalom Jones, the founding clergyman of the African Episcopal Church of St. Thomas, to be baptized.

George, born 1/14/1811, was baptized on 4/7/1811.
Mary, born 2/5/1813, was baptized on 8/14/1813.
Hannah, born 2/22/1817, was baptized on 7/11/1817.

Any additional information on George and Esther Johnson, their family and descendants would be greatly appreciated.

Thank you.