Dr. Chang is currently working as a Precision Agriculture Automation Engineer and Assistant Professor, in the Department of Agricultural & Biosystems Engineering, South Dakota State University. He worked at Living System Laboratory of Samsung Electronics. He was a Postdoctoral Research Fellow at the University of California Davis, Bio-image and Sensing Center at North Dakota State University, and at the Precision Agriculture Research Program at Nova Scotia Agricultural College, Canada. He was also an Assistant Professor at Dalhousie University, Canada, prior to his current position. Dr. Chang has founded the Bio-systems Automation & Robotics Lab at Dalhousie University, Canada, and keeps working at South Dakota State University.