Four of the men, Jenner, Calver, Brotze and Hager all took on a similar project in 1911, as members of the Seattle Cartoonists' Club in a book called The Cartoon; A Reference Book of Seattle's Successful Men.

His father moved the family to the Seattle area when Ernest was very young (November, 1876).

After his mother died (1891), his father remarried Clara I. Hough Jenner, and there were three more children.

On his 1917-1918 draft card, he said he was a commercial artist for Western Engraving, in the Seattle Post-Intelligencer Building.

[8] He married Bertha Crockett[1] and they had two children, Robinson C. and Elizabeth C. Jenner.