A poet who loves mathematics has written many picture books, poems and papers for more than 20 years, inspiring children to understand the beauty, profundity and interest of mathematics. His works include poems such as Counting the Caterpillar, Grandpa's Quilt, Hear me? Poetry and prose works of teenagers, I must tell you: poetry and prose works of girls. She also invented three kinds of math toys. She and her husband live in Palo Alto, California, USA. They have three sons.