Riddle was one of the first American women architects as well as a survivor of the R.M.S. Lusitania, according to the Hartford Courant. She was a graduate of Miss Porter's School in Farmington. Riddle was the first woman to become a licensed architect in both New York and Connecticut. She designed the family estate Hill-Stead (now the Hill-Stead Museum) in Farmington. Riddle also contrived the Avon Old Farms School in Avon.
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