"Grinnell et al." refers to a group of authors, likely because there are more than two (et al. is a Latin abbreviation meaning "and others"). In this case, it likely refers to:
- Richard M. Grinnell Jr., the primary author. He's a professor and holds the Clair and Clarice Platt Jones/Helen Frays Endowed Chair of Social Work Research at Western Michigan University.
- Peter A. Gabor, a professor at the Faculty of Social Work at the University of Calgary.
- Yvonne A. Unrau, a professor at the School of Social Work at Western Michigan University.
Together, they are known for their work on program evaluation in social work. Their most prominent work is likely:
- Program Evaluation for Social Workers: Foundations of Evidence-Based Programs (8th edition, 2019, Oxford University Press). This book explores methods for evaluating the effectiveness of social work programs.
While "Grinnell et al." might have co-authored other works, this book is their most well-known contribution based on search results.
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