William Chueh is an Assistant Professor in the Materials Science & Engineering department and a Center Fellow of the Precourt Institute of Energy at Stanford University. He leads a group of students and researchers developing efficient electrochemical routes for converting solar energy to chemical fuels and subsequently to electricity. Snapshots of never-before-seen dynamics in energy conversion devices lead to new insights into the design of functional materials with novel compositions and structures, such as those for water-splitting membranes, fuel cells, and metal-air batteries.