In 1888, the firm was commissioned by Senator and Mrs. Leland Stanford to join landscape architect Frederick Law Olmsted in planning the campus for Stanford University. For major commissions in Chicago and the World's Columbian Exposition, Coolidge moved to Chicago and the firm opened its branch office there in 1893, in which many Prairie School architects received their early professional training, notably Hermann V. von Holst who was head draughtsman.
In 1888, the firm was commissioned by Senator and Mrs. Leland Stanford to collaborate with landscape architect Frederick Law Olmsted in planning the campus for Stanford University. For major commissions in Chicago and the World's Columbian Exposition, Coolidge moved to Chicago and the firm opened its branch office there in 1893, where many architects of the Prairie School style received their early professional training, notably Hermann V. von Holst who was head draughtsman.