Jianguo (J.G.) Wen is a material scientist at the Center for Nanoscale Materials who studies materials structures at high spatiotemporal resolution for understanding structure/property relationship using advanced transmission electron microscopy. The materials he studies covers nanomaterials, batteries, catalysts, photovoltaic materials, and superconducting, ferroelectric, piezoelectric materials etc. He also actively studies phase transformation mechanism including graphite/diamond and water/ice. Recently, his research focus is on studying the correlation between atomic structures of quantum emitters and their optical performance.