He is best known as the architect of Navy Pier and for designing over 100 buildings for the Chicago and North Western Railway.

Born in Lewiston, Maine, Frost was first a draftsman in Boston, and graduated from the Massachusetts Institute of Technology in 1876.

[1][2] He moved to Chicago in 1882, when he began a partnership with Henry Ives Cobb.

Frost designed 127 buildings for the Chicago and North Western Railroad alone.

[2] The city of Frost, Rome Township, Faribault County, Minnesota, was named for Charles S.