Please answer a question about the following article about New Haven, Connecticut:

New Haven has many architectural landmarks dating from every important time period and architectural style in American history. The city has been home to a number of architects and architectural firms that have left their mark on the city including Ithiel Town and Henry Austin in the 19th century and Cesar Pelli, Warren Platner, Kevin Roche, Herbert Newman and Barry Svigals in the 20th. The Yale School of Architecture has fostered this important component of the city's economy. Cass Gilbert, of the Beaux-Arts school, designed New Haven's Union Station and the New Haven Free Public Library and was also commissioned for a City Beautiful plan in 1919. Frank Lloyd Wright, Marcel Breuer, Alexander Jackson Davis, Philip C. Johnson, Gordon Bunshaft, Louis Kahn, James Gamble Rogers, Frank Gehry, Charles Willard Moore, Stefan Behnisch, James Polshek, Paul Rudolph, Eero Saarinen and Robert Venturi all have designed buildings in New Haven. Yale's 1950s-era Ingalls Rink, designed by Eero Saarinen, was included on the America's Favorite Architecture list created in 2007.

Who was the architect that design the New Haven Free Public Library?
Cass Gilbert