From 1908 to 1920 he served as supervising architect for the Washington National Cathedral.

He was also supervising architect for the University of California, Berkeley campus from 1927 to 1931.

He served as supervising architect from 1943-1949.

The current capitol building was built from 1850 to 1851, with Barachias Holt as supervising architect.

Nevertheless, following delays in the building work attributed to financial problems, the position of supervising architect was finally given to Mountfort in 1873.

Beginning in 1874, Clarke accepted various foreign assignments as supervising architect to the crown, most notably Tehran.

White, the university architect, acted as supervising architect.

Renwick was also supervising architect for the Commission of Charities and Correction.

From 1874 to 1877, Potter served as supervising architect of the United States Treasury.

His name is listed ex officio as supervising architect of hundreds of federal buildings built throughout the United States during the period.