Jonathan Longfellow Cilley was born on 25 January 1838 at Cincinnati, Ohio.¹ He was the son of Jonathan Cilley and Sarah Lee.¹ He married Mary Peacock Hubbard, daughter of Lucius Virgilius Hubbard and Mary Ridgway Peacock, on 26 April 1869.¹ He died on 18 March 1903 at Brooklyn, Kings, New York, at age 65.²
     
     Jonathan Longfellow Cilley appeared on the 1850 Federal Census of 8th ward, Cincinnati, Hamilton, Ohio, in the household of Jonathan Cilley and Sarah Lee.³ He resided in September 1902 at Brooklyn.²
     Obituary published 19 March 1903 by New York Times, New York, New York.²
     Physician, was born in Cincinnati, Ohio; son of Jonathan and Sarah (Lee) Cilley. He was graduated at Harvard in 1858 and studied medicine with Dr. W. H. Mussey, in Cincinnati. In 1864 he served in the 7th Ohio militia, and afterward on the Mississippi river gunboats. He took his medical degree from the Miami medical college of Cincinnati in 1866, and was appointed physician in the Commercial hospital of that city. He became demonstrator of anatomy in the Miami medical college in 1871, and professor of physiology and histology in the Ohio college of dental surgery in 1873. Professor Dwight in "Frozen Sketches," gives him the credit of being the first in English writings to describe correctly what medical men understand as the main fissure of the lungs. He severed his connection with the Miami medical college in 1878, and became demonstrator of anatomy in the Medical college of Ohio where he was made adjunct professor of anatomy in March, 1887. He was lecturer in osteology from 1882, and in 1887 he was appointed lecturer on artistic anatomy in the Cincinnati museum association art academy.⁴