Michelle A. Collins-Greene, PhD, ABGP, CGP, AGPA-F, consults, supervises, and mentors group psychotherapists nationally. In her private practice in New Haven, CT, and Port Washington, NY, she leads several psychotherapy groups. She has extensive experience creating supervision groups in hospital and community mental health centers.

Maria T. Riva, PhD, is Emerita Professor of Counselling Psychology at the Morgridge College of Education, University of Denver. She publishes on supervision, group supervision, and group psychotherapy topics with a recent APA-spotlighted article coauthored with Randi Smith, PhD.

Noelle L. Lefforge, PhD, ABPP, CGP, AGPA-F, is a professor and Clinical Director at the University of Denver's Graduate School of Professional Psychology. She has published group psychotherapy education and training guidelines in training and education in professional psychology that are shaping the future of supervision of group psychotherapy.