Born: October 29, 1857, Oakville, Ontario, Canada.
Died: November 22, 1928, Philadelphia, Pennsylvania,.
Buried: Merion Memorial Park, Bala Cynwyd, Pennsylvania.
Johnson was the son of John Garrison Johnson and Mary Ann Mackay, and husband of Minnie Serepha Goosley of Liverpool, Nova Scotia.
He was educated at the Hamilton Institute and Upper Canada College.
In 1874, he joined the British Methodist Episcopal Church. He was licensed to preach in Toronto, and joined the annual conference in 1875.
The next year, he became a deacon in Halifax, Nova Scotia, and an elder in 1880.
In 1908, Johnson was elected Bishop for South Africa. His denominational affiliation is somewhat unclear, as the African Methodist Episcopal (AME) Church also claims him as their bishop to South Africa. His tune Oakville appears in the 1898 edition of the AME hymnal.