In the 1890s he was joined by draftsman and later architect Harold S. Graves, who took over the practice when Kelley retired after World War I.
[2] Kelley was a founding member of the Boston Architectural Club in 1889,[2] and joined the American Institute of Architects in 1901.
[3] Kelley was first married in 1882 to Eleanor Hale Sweetser of Lynn, who died in 1922 while traveling abroad in France.
[1] For much of his life, Kelley lived and worked in a house at 57 Mount Vernon Street in Beacon Hill, which he bought from the estate of Charles Francis Adams.
Circa 1911-13 he and his first wife built a second home, designed by himself, at 12 Tupelo Road in Swampscott.