Susan Yoon, PhD, is a Professor of Education in the Graduate School of Education at the University of Pennsylvania. She focuses on complex systems, social network and social capital applications for learning, and the learning sciences. Her work spans both formal and informal science and technology environments where she has developed tools, curricula, and PD activities to support sense making through visualization tools, socioscientific sensibilities, and decision-making about science in real world contexts. She has researched the affordances of wearable and mobile technologies, augmented reality technologies, digital knowledge-building collaborative platforms, and agent-based computer simulations that support STEM content learning and participation with middle and high school students and teachers. Over the past 10 years, she has also developed lenses and resources to support growth in teacher knowledge and skills for instruction of innovative STEM approaches. In particular, she investigates how teachers can develop adaptive expertise and both human and social capital in extended professional development activities. She is the recipient of the 2009 AERA Division C Jan Hawkins Award for early career contributions in learning. She sits on the Board of Directors for the International Society of the Learning Sciences and is co-Editor-in-Chief of the Journal of the Learning Sciences for the period 2017–2020.