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(800) 432-8781

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or to schedule an appointment, please call 320-235-4613

Big Stone Clinicians

Tierria McGlothin

M.S.N., P.M.H.N.P.-B.C.


Tierria McGlothin is a board-certified Psychiatric Mental Health Nurse Practitioner, currently relocating from South Florida back to her home state of Mississippi. She is an experienced clinician most recently working in inpatient psychiatry and tele-psychiatry in correctional settings. Prior to becoming an NP, Ms. McGlothin worked as an RN for six years, starting out at the University of Mississippi Medical Center before moving into travel nursing, with assignments in California, Texas, and Florida. Ms. McGlothin earned a Bachelor of Science in Nursing from Alcorn State University in 2010, and was named Nurse Rookie of the Year by the Mississippi Nurses Association in 2012. She completed her MSN in 2016 through the online PMHNP program at the University of South Alabama.

Masters Prepared Providers

Mackenzie Moen

M.S.W., L.G.S.W.


Mackenzie provides assessments as well as individual, group and family therapy services to children, adolescents and their families through the School Linked Mental Health Program for Woodland Centers. She also provides services to people of all ages through the outpatient program. She received a Bachelor’s Degree in Social Work from Minnesota State University Moorhead in 2013. She graduated with a Master’s Degree in Social Work from University of North Dakota in 2017. Mackenzie’s prior social work experiences include children’s mental health and child protection case management as well as foster care licensing. She is currently working to obtain her license as a Licensed Independent Clinical Social Worker.

Cassie Sonstegard

M.A., L.P.C.C. Licensed Professional Clinical Counselor


Ms. Sonstegard has been working at Woodland Centers since 2007 and has experience in many programs including Adult Foster Care, Crisis Center, Adult and Youth Partial Hospital programs, School Linked Mental Health, Outpatient services, and Assertive Community Treatment. She received her Bachelor of Arts degree in Psychology from Carroll College in Waukesha, Wisconsin in 2007 and her Masters of Arts in Counseling and Psychological Services from Saint Mary's University in 2010. She is currently working as a Licensed Professional Clinical Counselor (L.P.C.C.) in the Assertive Community Treatment. She is the team leader and provides clinical supervision for the ACT program, serving the SPMI population in Big Stone, Swift, Chippewa, Lac qui Parle, and Kandiyohi counties.

Psychiatric Providers