When he was 5 years, he moved to Montgomery Square in Montgomery County, PA. At age 19, he began studying medicine under Dr. John L. Foulke in Gwynedd, PA. He graduated from the Philadelphia College of Medicine and Surgery in 1854. For 18 months, Dr. Knapp practiced medicine in Charleston, SC.
His former mentor Dr. John L. Foulke retired in 1857, and Dr. Knapp took over his practice in Gwynedd, and continued until his failed health in 1915. He engaged in the practice for 61 years!
Dr. Knapp descended from an old colonial family who originally came from Suffolk, England, and settled in New England in 1532.
He married Annie Acuff of Gwynedd, and had one son: Kenneth.
His home was replaced by a modern developed house.
Mueller, A.H. Atlas of the North Penn Section of Montgomery County, Pa., Plate 29, 1916.
Scott, J. D. Montgomery County 1877, Gwynedd, North Wales, Ambler, Royer's Ford, Limerick Station, 1877.
"The Journal of the American Medical Association." Volume 69, No. 14. October 6, 1917: 2060.
"Wissahickon Valley Public Library's Ambler Gazette Collection." POWER Library: Pennsylvania's Electronic Library. Accessed July 6, 2020. http://digitalcollections.powerlibrary.org/cdm/landingpage/collection/wivp-gazett.