Guofeng Chen, PhD, Electrical Staff Engineer in Skyworks Solutions, Inc., San Jose, CA, USA. He received the Ph.D. degree in electrical engineering from Northeastern University, Boston, MA, USA, in 2019. He has been a Research Assistant with the Northeastern Sensors and Nano Systems Laboratory, Boston, since 2015. His research interests include piezoelectric transducers such as micro-machined radio frequency resonators, filters, and ultrasonic transducers. He has coauthored more than 20 publications in those research areas.