A.R. Hart graduated to active member of the Alpine Club of Canada on the first summer camp in the area in 1907. In 1909 he made the first ascent of Glacier Peak with Val Fynn, L.C. (Jimmie) Wilson and C.A. Richardson. The following year (1910) he made the first ascent of Mount Babel with H.H. Worsfold, L.C. Wilson and Edward Wheeler.
In 1911 he attended the ACC camp at .. and in 1912 he joined Edward and Arthur Wheeler on an expedition to Strathcona Provincial Park on Vancouver Island where he was one of nine who made the first ascent of the Strathcona Matterhorn, later renamed Elkhorn.
In 1979 Hart received the Distinguished Service Award from the ACC.
Wheeler, E.O. "Mount Babel." Canadian Alpine Journal. Vol. 3. The Alpine Club of Canada. Banff, Alberta. 1911. p. 73.
Wheeler, E.O. "Mount Elkhorn, Strathcona Park." Canadian Alpine Journal. Vol. 5. The Alpine Club of Canada. Banff, Alberta. 1913. p. 44-48.
"The Wonders of Strathcona Park." Alberni Advocate. [Alberni, B.C.] (September 6, 1912.) p.1.