Cornerstone - Drug Rehab Scottsdale

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Clinical Staff

Cornerstone’s Clinical Staff

Cornerstone’s Clinical Team are experts in the field of addiction medicine and therapy. We have carefully selected each person in our clinical department to ensure that our clients receive the best care available to them.

Dr. Stacey Smith PhD

Chief Clinical Officer

Stacey is a licensed psychologist in both Arizona and Texas and has been working in the addictions field in residential and IOP settings since 2010. He has a wide variety of experience in the addiction field, including work with individuals who suffer from addictions to alcohol, drugs, intimacy/relationships, sex, and gaming addictions.  Early in his career, Dr. Smith trained in EMDR techniques, knowing the important role that trauma work plays in the recovery process. Most recently, examination of how the brain works and how technology can play a key role in client recovery has been a focus of his work.

Karen Williams

Clinical Director

Karen is a Licensed Professional Counselor specializing in Addiction Recovery, EMDR and Family Systems Theory at Cornerstone Healing Center in Scottsdale, AZ.  She holds a Master’s Degree in Professional Counseling from Grand Canyon University and has nearly 15 years of experience in substance use recovery, and the behavioral sciences.  

Dr. Paul G. Flatley


Dr. Paul G. Flatley is a board-certified emergency medicine attending physician having practiced 20 years in the Scottsdale emergency departments.  During his tenure, Dr. Flatley spent 6 years as the medical director for the emergency department as well as function part-time as the emergency department physician to the Arizona coyotes hockey team.

Dr. Flatley transitioned to addiction medicine in 2017 when he opened Direct2Recovery.  His clinic functions as a brick and mortar medication assisted treatment (MAT) clinic catering predominantly to those seeking treatment for opioid addiction and alcoholism.  He has built a team of 5 clinical providers, 2 counselors, and 3 office personnel caring for over 500 patients in the Phoenix area.


Samantha Esquivias


Samantha is a dual board certified Family Nurse Practitioner (FNP) as well as a Psychiatric Mental Health Nurse Practitioner (PMHNP). She completed her FNP program at Grand Canyon University and her PMHNP program at Creighton University. 

Her specialties include sleep and addiction medicine.  She has a wide array of experience in addiction and psychiatry. She has worked with patients in the inpatient detox and inpatient psychiatric arena to outpatient Medication Assisted Treatment and primary care services. Her passion is to help patients walk the path of recovery while making real changes in their lives.

Geraldine Rosa

Medical Assistant

With over 20 years in health care and 12 years in mental health and substance abuse Geraldine comes to Cornerstone with a passion to help those suffering from addiction come out on the other side. She has a dedication to volunteering within the community and enjoys taking classes and reading in her spare time.

Michael Marino

Primary Therapist

Michael began his recovery journey in February 2017 and has worked in the behavioral health field for the past three and a half years, starting as a BHT at Calvary, and recently as a Case Manager/Clinical Supervisor at Crossroads for men. Michael is currently working on his Masters in Clinical Mental Health Counseling and has a passion for assisting people in need and enjoys the face-to-face communication of helping others through his own practical and professional experience.

Lionel Estrada

Primary Therapist

Lionel has been working to help those struggling with substance abuse for over three years starting at Crossroads for men, Community Bridges, and Community Medical Services before landing his dream job as a therapist at Cornerstone. While staying true to his own recovery program, Lionel is currently working on his Masters in Addiction Counseling.

Liz Carbajal

Primary Therapist

Liz is a Licensed Associate Counselor working towards the LPC licensure and specializes in Cognitive Behavioral Therapy. She received her Masters Degree from Grand Canyon University in Professional Counseling. Liz most recently worked for Terros Health Care specializing in substance abuse recovery. 

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Cornerstone Healing Center

16444 N 91st St, Building H

Scottsdale AZ 85260