 From 1902 Mauran became a Fellow of the American Institute of Architects, and was appointed by Theodore Roosevelt to the first United States Commission of Fine Arts in 1910.In 1915 he was elected President of the AIA; in 1925 he served as head of the St. Louis Memorial Plaza Commission.Mauran died unexpectedly after an appendicitis attack in 1933, at the family's summer home in New Hampshire.