Several additional branches opened shortly afterwards, including one in the Old Main building of Wayne State University. But it was not until 1910 when Andrew Carnegie, the great American library philanthropist of the early 20th century, donated funds did Detroiters decide to build a larger central library to supplement Centre Park. Property near Woodward and Kirby was purchased and in 1912 Cass Gilbert was commissioned to construct his design of a three-floor, early Italian Renaissance-style building. Due to delays and World War I, the Main Library did not open until March 21, 1921. It was dedicated June 3, 1921. In 1937, the Detroit Public Library hired its first African-American librarian, Marjorie A. Blakistone; Blackistone worked throughout her career to expand the library's African-American literature collection. The library system's bookmobile service began in 1940.