William LaBarthe Steele (May 2, 1875 – March 4, 1949) was an American architect from Chicago, Illinois. He is considered a principal member of the Prairie School Architectural Movement during the early 20th century. Career After graduating from the University of Illinois, Steele worked under renowned architect Louis Sullivan in Chicago, Illinois from 1897 to 1900. He later moved to Pittsburgh, Pennsylvania where he worked at several firms. In 1904, he settled in Sioux City, Iowa, where he stayed for 25 years until moving to Omaha, Nebraska in 1929. Around this time, he and Thomas Rogers Kimball founded an architectural firm that eventually became Steele, Sandham, and Steele. He designed over 250 commercial buildings, churches, synagogues, homes, schools, and government buildings in Iowa, Nebraska, South Dakota, and Minnesota. The Woodbury County Courthouse in Sioux City is considered to be a premier example of Prairie School aesthetics, which he developed along with Minneapolis-based architects George Grant Elmslie and William Gray Purcell. All three men had previously worked for Sullivan in various roles. The Courthouse, along with Walthill Hospital in Nebraska (1912), are both designated National Historic Landmarks. Over 20 of his surviving works are on the National Register of Historic Places (NrHP). Steele was one of the founding members of The Nebraska State Board of Examiners for Professional Engineers and Architects (now known as the Nebraska Board of Engineers and Architects). He served on the Board from 1937 to 1942. Selected works Sioux County Courthouse (Orange City, Iowa) (1902–04), designed by architect Wilfred W. Beach; Steele worked as a draftsman on the project before it ended, and later partnered briefly with Beach. NRHP-listed. Florence Crittenton Home (1906), 1105-1111 28th St., Sioux City, IA Beach & Steele, formerly NRHP-listed Dr. Susan LaFlesche Picotte Memorial Hospital (1912), 505 Matthewson St., Walthill, NE Steele, William, NRHP-listed Davidson Building (1913), 505 6th St., Sioux City, IA Steele, William LaBarthe, NRHP-listed St. Patrick's Catholic Church, Cedar (1915), 4 mi. W of Churdan on E 19, .5 mi. N on gravel rd., Churdan, IA Steele, William LeBarthe, NRHP-listed St. Casimir Lithuanian Roman Catholic Church (1915), Sioux City, IA, since demolished. H.H. Everist House (1916–17), 37 McDonald Dr., Sioux City, IA Steele, William LaBarthe, NRHP-listed Woodbury County Courthouse (1916–18) designed by George Grant Elmslie in collaboration with the Sioux City architect William L. Steele and Elmslie's partner, William Gray Purcell, a National Historic Landmark First Congregational Church, Former