Analysis of information sources in references of the Wikipedia article "Ernest Henry Wilson" in English language version.
Following these adventures, Wilson served as Assistant Director of the Arnold Arboretum (1919-1927), and after the death of Charles Sprague Sargent, he was appointed Keeper of the Arnold Arboretum, a post he held until his tragic death in an automobile accident in 1930 (Plimpton, 1979, pp. 84-87).
Wilson's exact title at the Arboretum during this period is not recorded, although in one article he refers to himself as 'Dendrologist, Arnold Arboretum.' In 1916 he received an honorary Master of Arts degree from Harvard, and in 1919 he was appointed Assistant Director of the Arnold Arboretum, without limit of time.