[2] In addition to working as a pharmacist and owning drug stores, Chapman also operated a real estate and insurance agency.
[7] During the Spanish–American War, he was commissioned a first lieutenant on the staff of Vermont's 1st Brigade, and provided advice and guidance on hygiene and medical support for troops preparing to serve overseas.
[7] During and after his retirement, Chapman was the treasurer of the unit fund for Rutland's Company A, 1st Vermont Infantry Regiment, a post he held for a total of 42 years.
[2] When Field's commission was terminated in 1903 after prisoners in his custody effected an escape, Chapman was appointed acting Marshal by Vermont's federal district judge, Hoyt H.
[13] He resigned as deputy in May and was succeeded by Esther E. Anderson, who had previously served as an assistant to Fred S. Platt, the clerk of Vermont's U.S. District Court.
[9] He was rescued by his nurse, but after she fell asleep on the morning of June 29, Chapman killed himself by going to the basement of his home, using a razor to slash arteries in his legs, and cutting his throat.