Kenneth Libbrecht is a professor of physics at Caltech, where he studies the molecular dynamics of crystal growth, especially how ice crystals grow from water vapor, which is essentially the physics of snowflakes. He has authored several books on this topic, including The Snowflake: Winters Secret Beauty, The Art of the Snowflake, and Ken Libbrechts Field Guide to Snowflakes. He lives in Pasadena with his wife, Rachel Wing. They have two children.