Harper was born in Parramatta and educated at Newington College and King's School.
He spent several years in literary employment, then in 1871 started with the Railways as a clerk in John Whitton's office.
In 1877 he was appointed clerk supervising goods staff at Redfern railway station.
The post of Chief Commissioner was then filled by James Fraser, who had been acting during Harper's absence.
[citation needed] Harper married Sarah (c. 1853 – c. 10 October 1929)[4] Their children include: