[10] Hahn's winning proposal for the city of Winnipeg's war memorial caused a national controversy when the sculptor's German ancestry was revealed in 1925.

The following year he was awarded the contract for the Edward Hanlan monument (1926), erected on the Canadian National Exhibition grounds, and moved to the Toronto Islands in 2004.

[11] In 1929 he won the competition for a memorial to Sir Adam Beck, his most important and largest monumental project, unveiled in 1934 on University Avenue, Toronto.

Hahn was a member of The Arts and Letters Club of Toronto and served as the first President of the Sculptors' Society of Canada, which he established with Frances Loring, Florence Wyle and Elizabeth Wyn Wood in 1928.

The Ontario Heritage Foundation plaque for the South African War Memorial (Toronto) erroneously states that Walter Seymour Allward studied under Emanuel Hahn, when in fact it was the contrary.

[12] Hahn's last work is likely the Robert H. Saunders Memorial, a bas relief marker located on University Avenue south of College Street in 1957.