Dr. Charlene Zietsma Portrait of Dr. Charlene Zietsma. https://www.smeal.psu.edu/fcfe/people/charlene-zietsma.jpg/view https://www.smeal.psu.edu/@@site-logo/logo.png Dr. Charlene Zietsma Portrait of Dr. Charlene Zietsma. Click to view full-size image… Size: 18KB