[4] At the age of 15, he moved to London, Ontario, to work as a news agent.

[3] He quit his job as a news agent and sold self-published hotel registers.

[3][4] He was chairman of the New York State Commission for the Panama–Pacific International Exposition in San Francisco in 1915.

[6] He served as park commissioner of Buffalo and was a member of the executive committee of the State Associated Press.

[4] Mack died following heart trouble on December 26, 1932, at his home at 1105 Delaware Avenue in Buffalo.