He studied at Trinity College, Toronto and was deputy pastor of St. Anne's Church in Canada.
In 1890, Waller arrived in Japan as a missionary with his wife, Lydia Susan, of the Anglican Church of Canada first working in Tokyo and later in Fukushima Prefecture.
In 1912, Waller wrote: If the rest of Canada outside of Toronto heard of the Japanese work at all, they usually had the vaguest ideas about it... even clergymen wishing to introduce the missionary from Japan to their congregations, would ask beforehand in what part of China we had been working[7]Waller and his wife had five children born in Japan, Justin Benjamin, John Charles, George Awdry,[8] Wilfred, and a daughter, Kiku.
[9][10] At the beginning of the Pacific War, Waller was interned in the compound of the Canadian Academy in Kobe, and then repatriated to Canada in 1942.
[13][14] A book written in Japanese, Waller, His Life and Family (ウォーラー司祭 その生涯と家庭, Uo-ra- shisai, sono shōgai to katei) by Kobayashi Shirou (小林史郎) was published in 2006.