Charles Sumner Frost
Charles Sumner Frost (May 31, 1856 – December 11, 1931) was an American architect. 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. While working in Boston he worked for the firm of Peabody and Stearns from 1876 to 1881. He moved to Chicago in 1882, when he began a partnership with Henry Ives Cobb. Together, they established the firm Cobb and Frost, which was active from 1882 to 1898. After the partnership ended, he worked alone. Frost married Mary Hughitt, a daughter of Marvin Hughitt, the President of the Chicago and North Western Railroad, in 1897. On January 1, 1898, he partnered with his brother-in-law, Alfred Hoyt Granger, to form the firm of Frost and Granger. Frost and Granger were known for their designs of train stations and terminals, including the now-demolished Chicago and North Western Terminal. Frost designed 127 buildings for the Chicago and North Western Railroad alone. After Frost and Granger dissolved in 1910, Frost continued to work independently, designing such structures as the Navy Pier Auditorium.  Frost was a Fellow of the American Institute of Architects. He retired on December 31, 1928 and died on December 11, 1931 in Chicago. The city of Frost, Rome Township, Faribault County, Minnesota, was named for Charles S. Frost.
- Union Depot, 201 South Main Street, Leavenworth, Kansas, 1888 (with Cobb)
- Chicago and North Western Railway Station, Wisconsin Avenue, Milwaukee, Wisconsin, 1889, demolished 1968
- Morgan Park Library (George C. Walker Branch Library) in Chicago, 1889-90
- Adams Memorial Library in Wheaton, Illinois, 1891
- The Second Union Station, Omaha, Nebraska, 1891
- Western Bank Note Building in Chicago in 1891
- Chicago and Northwestern Railroad Depot, Fond du Lac, Wisconsin, 1891
- Chicago and North Western Railway station, 200 North 6th Street, De Kalb, Illinois, 1891 (with Granger)
- Chicago and North Western Railway station, 724 Green Bay Road, Glencoe, Illinois, 1891
- Chicago and North Western Railway depot, Broad Street, Lake Geneva, 1891
- Chicago and North Western Railway depot, Milwaukee Avenue, South Milwaukee, Wisconsin, 1893
- Maine State Building, 1893 for the World's Columbian Exposition
- Richard T. Ely House in Madison, 1896
- Chicago and North Western Railway depot, North West and West 5th Streets, Carroll, Iowa, 1896
- Chicago, Milwaukee, St Paul & Pacific Railroad depot, 115 Collins Street, Oconomowok, Wisconsin, 1896
- Milwaukee Road Passenger Depot in Green Bay, 1898 (Frost & Granger)
- Milwaukee Road Depot, 201 3rd Street South, Minneapolis, Minnesota, 1899
- Chicago and North Western Railway station, Western Avenue, Lake Forest, Illinois, 1899 (Frost & Granger)
- Chicago and North Western Railway depot, 200 Dousman Street, Green Bay, Wisconsin, 1899 (Frost & Granger)
- Union Depot, 417 Chapple Avenue, Ashland, Wisconsin, 1900
- Chicago and North Western Railway depot, 526 Main Street, Ames, Iowa, 1900
- Rock Island Lines Passenger Station, 5th Avenue at 31st Street, Rock Island, Illinois, 1901 (Frost & Granger)
- Chicago, Milwaukee, St Paul & Pacific Railroad station, 127 South Spring Street, Beaver Dam, Wisconsin, 1901 (Frost & Granger)
- Chicago and North Western Railway depot, Racine, Wisconsin, 1901 (Frost & Granger)
- LaSalle Street Station, 1902 (Frost & Granger)
- Chicago and North Western Railway station, Oak Street Northwest, Sleepy Eye, Minnesota, 1902 (Frost & Granger)
- Chicago, Milwaukee & St Paul Railroad depot, 640 West Washington Avenue, Madison, Wisconsin, 1903 (Frost & Granger)
- Lake Bluff station, Lake Bluff, Illinois, 1904 (Frost & Granger)
- Chicago and North Western Railway station, Main Street, Breda, Iowa, 1907 (Frost & Granger)
- Norwood Park station, Norwood Park, Illinois, 1907 (Frost & Granger)
- Chicago and North Western Railway depot, Antigo, Wisconsin, 1907 (Frost & Granger)
- St. Luke's Hospital Complex in Chicago, 1908 (with Granger), 1439 S. Michigan/1440 S. Indiana
- Chicago and North Western Railway Power House, Chicago, 1909 (Frost & Granger)
- Chicago and North Western Terminal, 1911 (with Granger)
- Electric Railway Chambers, Winnipeg, Manitoba, 1912
- Minneapolis Great Northern Depot, 1913
- Navy Pier Auditorium in Chicago, 1916
- Railroad and Bank Building, 176 East 5th Street, St. Paul, Minnesota, 1916 
- Union Depot, St. Paul, Minnesota, 1917
- Stuart Cohen and Susan Bejamin; North Shore Chicago; Houses of the Lakefront Suburbs 1890-1940 Acanthus Press, 2004, p.311
- Coventry, Kim; Meyer, Daniel; Miller, Arthur H. (2003-01-01). Classic Country Estates of Lake Forest: Architecture and Landscape Design, 1856-1940. W. W. Norton & Company. p. 296. ISBN 9780393730999.
- Frost Papers at UMN
- Leonard, John William; Marquis, Albert Nelson (1908-01-01). Who's who in America. Marquis Who's Who. p. 676.
- Upham, Warren (2001-01-01). Minnesota Place Names: A Geographical Encyclopedia. Minnesota Historical Society Press. p. 189. ISBN 9780873513968.
- Potter, Janet Greenstein (1996). Great American Railroad Stations. New York: John Wiley & Sons, Inc. pp. 295, 297, 301, 303, 316, 317, 328, 358, 405, 406, 408, 410, 545. ISBN 978-0471143895.
- "Morgan Park Library, Chicago". Inland Architect and News Record. 15: 51. April 1890.
- Butler, Patricia A., and Sharon Crawford (1985). Geneva Lake Area Intensive Survey: and Architectural/Historical Report, Vol. 1. Geneva Lake Land Conservancy (Wis.), State Historical Society of Wisconsin.
- Eckert, Kathryn Bishop (2000-01-01). The Sandstone Architecture of the Lake Superior Region. Wayne State University Press. p. 203. ISBN 0814328075.
- Biggs, Douglas L., and Gloria J. Betcher (2014-06-09). Ames. Arcadia Publishing. p. 40. ISBN 9781467111638.
- Hannan, Caryn (2008-01-01). Illinois Encyclopedia. State History Publications. p. 353. ISBN 9781878592965.
- "HistoricPlaces.ca - HistoricPlaces.ca". www.historicplaces.ca. Retrieved 2016-07-31.
- Millett, Larry (1996-01-01). Twin Cities Then and Now. Minnesota Historical Society. p. 129. ISBN 9780873513272.
- "Railroad and Bank Building | Saint Paul Historical". Saint Paul Historical. Retrieved 2016-08-21.