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: Winter's Secret Beauty, The Art of the Snowflake, and Ken Libbrecht's Field Guide to Snowflakes. He lives in Pasadena with his wife, Rachel Wing. They have two children.
Rachel Wing is a park ranger for the city of Monrovia, California, at the foot of the San Gabriel Mountains. With a background in geology, she now specializes in balancing wilderness preservation with wildfire safety for nearby residents. Rachel loves to hike and climb in these hills, especially on the rare occasions when snow graces our desert-like plants. She has been accompanying Ken Libbrecht as a snowflake chaser for nearly 20 years.