Marianne Schneider Corey is a licensed marriage and family therapist in California and a National Certified Counselor. She received her master's degree in marriage, family, and child counseling from Chapman College. She is a Fellow of the Association for Specialists in Group Work and received the organization's Eminent Career Award in 2001.

She received the Lifetime Achievement Award from the American Mental Health Counselors Association in 2011, and is a member of that organization. She also holds memberships in the American Counseling Association, the American Group Psychotherapy Association, the Association for Specialists in Group Work, the Association for Multicultural Counseling and Development, the Association for Counselor Education and Supervision, and the Western Association of Counselor Education and Supervision.

In the past 40 years, Marianne Schneider Corey and Jerry Corey have presented workshops in group counseling for mental health professionals at many universities in the United States as well as in Canada, Mexico, China, Hong Kong, Korea, Germany, Belgium, Scotland, England, and Ireland.

In addition to Issues and Ethics in The Helping Professions, Dr. Corey has coauthored the following Cengage books: Groups: Process and Practice, 10th Edition (2018, with Gerald Corey and Cindy Corey); I Never Knew I Had a Choice, 11th Edition (2018, with Gerald Corey and Michelle Muratori); Becoming a Helper, 7th Edition (2016, with Gerald Corey); and Group Techinques, 4th Edition (2015, with Gerald Corey, Patrick Callanan, and Michael Russell)....