Idabel Office Staff

Our Team Is Proudly Offering Therapy In Idabel, Oklahoma

Cornerstone Counseling Services, LLC

412 S. Central Ave.
Idabel, OK 74745
580-286-2000 (OFFICE)
580-286-2002 (FAX)

amy  Amy Foster, M.Ed., HR Officer, Site Director, New Programs Consultant, Drug Testing Director, BHCM II 

 Amy is a graduate of Paris Junior College and Texas A&M University-Commerce. She graduated in August of 2023 with her masters degree in Clinical Mental Health Counseling from Lamar University.  She served in Texas and Oklahoma as a teacher for many years. In 2009 while teaching in Oklahoma, she began working as a Behavioral Health Rehabilitation Specialist for a local counseling agency. In 2010, she left her teaching career and began working for them as Program Director of after-school programs. In 2012, she and her father, Steven Foster, opened Cornerstone Counseling Service where she has served as Chief Operations Officer, New Programs Consultant, Drug Testing Director, and as a Behavioral Health Case Manager. Amy is also certified in DOT and non-DOT Drug and Alcohol Testing, is a DOT Qualified Specimen Collector Trainer, as well as a Breath Alcohol Technician Instructor. She is currently serving as the Site Director for offices at Idabel and McAlester, OK, and Paris, TX.


 Rea Mackenzie, Administrative Assistant, Assistant HR Officer, Medical Billing Specialist, Site Director

Rea is the Administrative Assistant in Hugo, OK. She is also the Assistant HR Officer, the Medical Billing Specialist, and a Site Director for the McAlester, OK office. When she isn't studying or working, Rea enjoys traveling with her two dogs, spending time with loved ones, or relaxing with a book. With over a decade of collective experience in customer service, sales, registration assistance and laying the foundation for business start-ups and filings, Cornerstone welcomes Rea Mackenzie to the team!


Cory Kuykendall, CFO, Milan Trainer/Private Insurance Representative

Cory has been with Cornerstone Counseling since the opening of the McAlester office in 2012. He serves as Chief Financial Officer, as well as the Milan Trainer and the Private Insurance Representative. He is an asset to those he serves at Cornerstone.



 Sydney Miller, Administrative Assistant 

Sydney is joining the Cornerstone Counseling Service LLC family as the new Administrative Assistant for the Idabel, OK location. She is Mom to one son, and spends her free time with her loved ones. Having spent over a decade in the customer service and sales industry, we are excited to welcome Sydney to our team.

Stuart Schuhmann In Idabel, Oklahoma

Stuart Schuhmann, LCSW, Clinical Director

Stuart Schuhmann graduated from Texas A&M-Commerce and began practicing in 2011. Stuart works in the Northeastern Texas and Southeastern Oklahoma region. He currently holds a Clinical Social Work license (LCSW) on both Texas and Oklahoma. He has completed the Batter's Intervention Program in Oklahoma. Stuart has also been trained by EMDRIA to address trauma related issues like PTSD. He assists clients struggling with issues involving anxiety, depression, mood/personality disorders, trauma and PTSD. He accepts clients of all ages and works with individuals, couples and groups. Stuart's philosophy is based on unconditional positive regard and meeting the client where they are. His career in the business world helps him better understand the stresses and struggles related to dealing with daily issues. He has an easy-going style with a passion with helping his clients work towards a purpose driven life.

Catherine Bruce In Idabel, Oklahoma

Catherine Valencia, LPC-S, NCC

Catherine is a Licensed Professional Counselor with a Master of Education in Clinical Mental Health Counseling. She has worked for Cornerstone Counseling since it was founded in 2012. She has earned her Master of Education in Clinical Mental Health Counseling. Catherine has served many roles, such as, Case Management, Rehab, and group work with individuals and families. During her practicum, she has worked with children, youth, adults, and families. Catherine advocates on behalf of her clients and families in support of keeping families together and will advocate for her clients. Catherine is trained in many forms of therapy including, but not limited to, EMDR trauma therapy, Postpartum Depression, Cognitive Behavioral Therapy.  Catherine is also a certified LPC Supervisor. Outside of work, Catherine enjoys reading, spending time outdoors and relaxing with friends and family.


Carla Gonzalez, MSW U/S


Jessica Matthews In Idabel, Oklahoma

Jessica Mathews, LPC

Jessica graduated from Southeastern Oklahoma State University with her Master's Degree in Behavioral Sciences in 2009. She enjoys working with the community and is dedicated to helping others. She is a mother to two boys and she enjoys spending time with her family. Jessica has been with Cornerstone Counseling since its beginning in 2012.

sun  Bruce Deerinwater, LPC

Tammie Gilbert In Idabel, Oklahoma

Tammie Gilbert, BHCM II

Tammie has been a Rehabilitation Specialist and Case Manager for Cornerstone since it was founded in 2012. She has a degree in Elementary Education from Southeastern Oklahoma State University. She works with schools, families and adults.


 Kayla Mitchell, BHCM II

Kayla has been a Rehabilitation Specialist/Case Manager since 2010 and she has been with Cornerstone Counseling since 2013.  She has a Bachelor’s Degree in Psychology.  She works with kids, adults, families, and schools.  She works with clients on things like: communication, anger, coping, anxiety, positive thinking, goals, and grief.  She also assists clients with linkage and referrals to community resources to help them with their needs.  Kayla sees clients in the Idabel and Hugo area. 



Cara Fuller, BHCM II

Cara is a Behavioral Health Case Manager II with a Bachelor’s degree in General Psychology, a Master’s degree in General Psychology, and a graduate certificate in School Counseling. Cara is a licensed school counselor, and she is currently enrolled at Southeastern Oklahoma State for clinical counseling while working towards certification as a licensed professional counselor. Cara has several years of experience in case management, including overseeing the case management program for a 120-bed domestic violence crisis shelter.  Cara also has several years of teaching experience, working with students as young as preschool all the way up to teaching adult education at a state prison. Cara is certified in trauma informed care. Cara sees clients of all ages and backgrounds in the Hugo and Idabel areas.


Sara Faust, BHCM I

Sara comes to Cornerstone with an extensive background in substance abuse and recovery modalities and has worked as a case manager for the last 3 years. Before her work in the medical field, she worked as a project coordinator for biometrics and survival of crew at Johnson Space Center in Houston. Getting an idea of how neuropsychology and therapy play a part in so many areas of every profession inspired her to set out on a new career path. Moving to Oklahoma from Houston, she has found herself a new home here in the country and adores horses in her free time and the unique therapy they bring. Sara is completing her collegiate studies and will soon graduate from the University of Arizona with a Bachelor's in Psychology. She plans to remain with Cornerstone through her higher education as she works towards becoming a licensed therapist.

Counseling Services

Couples & Family
Relationship Issues
Grief and Loss
Anxiety and Fears
Personal Growth
Parenting Support
Stress Management

Drug Testing Services

Post Accident
Return to Duty
Saliva Test
Reasonable Suspicion
Random Drug Screen Pool
Breath Alcohol Testing
Hair Follicle Testing
Fingernail Testing

Cornerstone Counseling Service, LLC
1849 Lamar Ave. Suite 160
Paris, TX 75460

Cornerstone Counseling Service, LLC
212 E. Duke
PO Box 61
Hugo, OK 74743

Cornerstone Counseling Service, LLC
412 S. Central Ave.
Idabel, OK 74745

Cornerstone Counseling Service, LLC
10 E. Chickasaw Ave.
McAlester, OK 74501

Cornerstone Counseling Service, LLC
603 W. Main
Tishomingo, OK 73460