Yongjie obtained his Ph.D. from Arizona State University for his work on multiscale modeling for 3-terminal GaPNAs/Si tandem solar cells. After that, he worked as a postdoc supervised by Dr. Stephen Goodnick at ASU on indoor photovoltaics and on nonequilibrium phonon effects on hot carriers. He recently joined Dr. Marco Saraniti as a postdoc. For ULTRA, he will work on thermal and electrical transport using the Monte Carlo method. He is generally interested in predictive methods for energy related topics.