[1] After he completed two years of education in Boston and Lynn, Massachusetts,[3] the Dominion Meteorological Service transferred him in 1898 to Victoria as weather observer and forecaster.

Reed, the senior scientist, and Denison were the coauthors of Victoria's first official weather report.

[3] At the 1911 meeting of the British Association in Portsmouth, Denison presented evidence gathered over 11 years from 1899 to 1910 in Victoria, B.C.

For use in the dome on the structure, Denison acquired a 5-inch equatorial telescope and made it available for supervised use by the public.

When E. Baynes Reed died in 1916, Denison was appointed director of meteorological services for British Columbia and the Yukon Territory.

For a few years, the Gonzales Hill Observatory was the primary source of scientifically accurate time west of the Canadian Rockies.

[11] Denison Road at Victoria's Gonzalez Hill Observatory is named in his honour.