Charles H. Zastrow, Professor Emeritus in Social Work, University of Wisconsin- Whitewater, Sarah L. Hessenauer Associate Professor in Social Work, University of Wisconsin-Whitewater Charles H. Zastrow, LCSW, PhD, is Professor Emeritus in Social Work at the University of Wisconsin- Whitewater. He is the author or co-author of Introduction to Social Work and Social Welfare, Social Work with Groups, Social Problems: Issues and Solutions, and Understanding Human Behavior and the Social Environment. In 2018, the National Association of Social Workers awarded him the distinction of being a "Social Work Pioneer." Sarah L. Hessenauer, LCSW, PhD, is Associate Professor in Social Work at the University of Wisconsin-Whitewater. She has worked as a practitioner and administrator in a variety of mental health and addictions agencies. She is coauthor of Social Work with Groups, and Understanding Human Behavior and the Social Environment.