Son of Rev. Gerrish and Catherine (nee Cooley Purdy) Barrett.
Born: July 12, 1848 in Unknown.
Died: Unknown in Unknown.
Married: Anna Crist October 17, 1858 in Philadelphia, Philadelphia County, Pennsylvania.

William Cooley Barrett, the eldest son of Rev. Gerrish and Catherine (Cooley-Purdy) Barrett, was prepared for college at the private school of William S. Cooley, A. M., at Philadelphia, entered Princeton College, New Jersey, in 1807, and was graduated therefrom, in course, in the class of 1871. He studied medicine with Dr. T. S. Henning, in Springfield, III., one year. He attended one course of medical lectures at St. Louis, Mo., and graduated in medicine at, and received his medical degree and diploma from, the Jefferson Medical College, Philadelphia, Penn., in March 1874. Immediately thereafter he was appointed resident physician and surgeon of the Presbyterian Hospital, Philadelphia, for the term of one year.

In the summer of 1875 he returned to Illinois, and was for that season the physician of the Hotel at Perry Springs, Pike County, Ill. In the autumn of 1875 he located at Clayton, Adams County, Ill., where he remained one year and secured for himself a good practice. In the autumn of 1876, he left Clayton and located at Philadelphia, Penn., where he now resides and successfully practices his profession. He is a member of the Board of Health of the City of Philadelphia, and is also one of the attending physicians of the Presbyterian Hospital of that City in the "Out Patient Department."