Chillida was a Spanish artist who studied in Madrid. Initially he studied architecture but then moved into drawing. He also studied and worked in Paris. The Guggenheim's website has an interesting biography of Chillida.
Bonevardi is a Princeton educated architect who works in sculpture, drawing, collage, watercolor and other sorts of public art. Every year his Tribute in Light is shown by the 9/11 Memorial Museum. You can find out more at www.gustavobonevardi.com.