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Meet Our Team

Our Team

We’ve assembled a highly-credentialed team of doctors, therapists, and specialists. They have collectively worked with thousands of clients throughout their careers in helping adolescents and young adults struggling with drug and alcohol abuse and/or mental health issues like depression, and anxiety.

We firmly believe a highly experienced, dedicated team with a passion for working with teens and young adults is the single most important piece of a program. Our team is fully committed to our mission of relentlessly pursuing successful clinical outcomes.

Our Leadership Team

Dianna Sandoval, LPC, LAC
Executive Clinical Director

Dianna has over 20 years of clinical experience working with adolescents and young adults, and has a Masters of Arts in Psychology from Regis University. 

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Dianna Sandoval
Dianna Sandoval, LPC, LAC
Executive Clinical Director

Dianna is a Licensed Professional Counselor and Licensed Addictions Counselor. Dianna has over 20 years of clinical experience working with adolescents and young adults. She earned her Master of Arts degree in Psychology from Regis University. Dianna has worked extensively with individuals struggling with substance use throughout her career. She started her career at Arapahoe House as a Program Manager and most recently, Dianna was the Clinical Director of a Denver-based substance use outpatient program as well as a Denver-based wellness program. Dianna manages the day-to-day clinical and administrative functions and conducts the initial assessments as well as the family orientation sessions.

Dr. Nathan Moore, MD
Medical Director, Colorado Springs & Cascade Canyon

Dr. Nathan Moore is Board-certified by the American Board of Family Medicine. Dr. Moore attended attended Duke University School of Medicine and obtained his M.D. in 1995.

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Dr. Nathan Moore, MD
Medical Director, Colorado Springs & Cascade Canyon

Dr. Nathan Moore is Board-certified by the American Board of Family Medicine. Dr. Moore attended Stanford University in Palo Alto, CA for his undergraduate work and then attended Duke University School of Medicine and obtained his M.D. in 1995.

Dr. Moore then came to Colorado and completed his residency in family medicine at the University of Colorado’s family medicine program at Rose Medical Center. He has a special interest in addiction medicine, treating patients with opioid use and alcohol addiction. In 2017, he became board certified in Addiction through the American Board of Addiction Medicine. Dr. Moore is the Medical Director for Sandstone Care's Detox Center. 

Dr. Donna Nikander, DNP, PMHNP-BC, FNP-BC
Medical/Psychiatric Nurse Practitioner, Colorado

Dr. Donna Nikander is Sandstone Care's Psychiatric Nurse Practitioner supporting our entire continuum of care in Colorado. 

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Dr. Donna Nikander, DNP, PMHNP-BC, FNP-BC
Medical/Psychiatric Nurse Practitioner, Colorado

Dr. Donna Nikander is Sandstone Care's Psychiatric Nurse Practitioner supporting our entire continuum of care in Colorado.  Dr. Nikander is a Family Nurse Practitioner and has practiced in the evolving field of Integrative Medicine for over 30 years. She is dual board certified in Psychiatry and Family Medicine and integrates both mental and physical health care across with a keen focus on adolescents and young adults. Dr. Nikander is formally educated in the field of Integrative Medicine and continues to develop patient-centered and post-doctoral educational programs. Dr. Nikander provides a personalized biomedical health management program which may include both pharmacologic and non-pharmacologic interventions such as customized bio- nutritional support.

Sherry McAtee, MHA, MS, BSN, RN, CRNP-PMH, PMHNP-BC, FACCP, MAJ (RET) USAF
Psychiatric Nurse Practitioner, North Bethesda

Sherry is our team’s Psychiatric Nurse Practitioner, with 32 years experience in healthcare.

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Sherry McAtee, MHA, MS, BSN, RN, CRNP-PMH, PMHNP-BC, FACCP, MAJ (RET) USAF
Psychiatric Nurse Practitioner, North Bethesda

Sherry is our team’s Psychiatric Nurse Practitioner, with 32 years experience in healthcare. She works collaboratively with the clients to diagnose, treat, and prescribe medications for substance use and co-occurring psychiatric disorders. She is licensed to conduct psychotherapy. Sherry has experience in the inpatient, partial hospitalization, and intensive outpatient levels of care for substance use disorders and psychiatric/co-occurring disorders. She is currently pursuing her Doctor of Philosophy (PhD) degree with the University of Maryland in Nursing. She is a member of the American Society of Addiction Medicine. She collaborates closely with the Sandstone Care staff on the management of clients’ medical and psychiatric/psychological issues related to addiction and co-occurring disorders.

Sarah Fletcher, LPC, CAC II
Program Director, Boulder

Sarah earned her Masters degree in Rehabilitation Counseling with a specialization in substance use disorder from Southern Illinois University in Carbondale.

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Sandstone Staff Member
Sarah Fletcher, LPC, CAC II
Program Director, Boulder

Sarah is a licensed professional counselor, who earned her Master’s degree in Rehabilitation Counseling with a specialized focus in substance use disorders from Southern Illinois University in Carbondale. Sarah has several years of clinical experience, including individual, family, and group therapy. Sarah moved to Denver from Chicago IL after working as an addictions therapist at Rosecrance Health Network. Sarah is trained in EMDR, mindfulness, and has extensive experience with both DBT and CBT. Sarah has worked in both residential and intensive outpatient settings throughout her career. Sarah is currently the Program Director at Sandstone Care, supporting all clinical levels of care at our Boulder facility, as well as supporting in clinical assessments.

Brannon Pruet, LPC, CAC II
Program Director, Denver

Brannon is a Licensed Professional Counselor and Certified Addiction Counselor II.

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Sandstone Staff Member
Brannon Pruet, LPC, CAC II
Program Director, Denver

Brannon is a Licensed Professional Counselor and Certified Addiction Counselor II. Brannon has 20 years of clinical experience working with adolescents and young adults. He earned his Master of Arts degree in Counseling, graduating Summa Cum Laude, from Denver Seminary, and is currently completing his Doctor of Philosophy Program in Psychology from Grand Canyon University. Brannon also currently manages the psychiatric assessment team at St. Anthony’s Hospital and previously facilitated individual and group psychotherapy as a primary therapist in both outpatient and in-patient programs. Brannon leads the adolescent groups and individual sessions, as well as assists with the initial assessments.

Kevin Barwick, LCPC-S
Program Director, North Bethesda

He has graduate and post-graduate degrees and training in Mental Health from the University of Maryland and Bowie State University.

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Kevin Barwick, LCPC-S
Program Director, North Bethesda

Kevin has worked in various capacities, including the Department of Social Services, private practice, hospitals, residential addictions treatment and in Outpatient Mental Health Clinics (OMHC's). He has graduate and post-graduate degrees and training in Mental Health from the University of Maryland and Bowie State University. His role at Sandstone Care is the Clinical Program Manager. He is very excited to be a part of the team.

Amy Armstrong, LPC, LAC
Program Director, Colorado Springs Detox

Amy is a Licensed Addiction Counselor and a Licensed Professional Counselor.

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Amy Armstrong, LPC, LAC
Program Director, Colorado Springs Detox

Amy’s passion for helping is rooted in a deep understanding of life challenges and the belief that every individual has the resiliency to overcome these challenges. She is a Licensed Addiction Counselor and a Licensed Professional Counselor. She is also EMDR trained. Her experience includes working with both mental health and substance use disorders. She has worked with both adolescents and adults and specializes in substance use disorders, dual diagnosis, and trauma treatment. Additionally, she focuses on mood disorders, thinking disorders, chronic impulsive, chronic relapse, anxiety, co-dependency, grief and loss, as well as issues related to self-esteem.

Casey Cherry, LPC, LAC
Program Director

Casey is a Licensed Professional Counselor and Licensed Addiction Counselor.

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Casey Cherry, LPC, LAC
Program Director

Casey holds a BA in Psychology from Judson University in Chicago Il, and a Masters in Community Counseling from Denver Seminary. Casey is a Licensed Professional Counselor and Licensed Addiction Counselor. Casey has over 20 years of experience working with adolescents and young adult populations in both inpatient and outpatient settings. Casey is currently the Program Director of Cascade Canyon.

You’ll be Seen, Valued, Heard & Respected

We inspire change by meeting you where you're at. We want to come alongside to support and help you start living the life you want to live.

Professional Events

We regularly host a variety of events at Sandstone Care. Most events are ideal for health professionals looking for fresh perspectives, educational presentations, and training. Each educational presentation offers CEUs and CPDs.

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