The Cornerstone Team

It may feel like you're the only one going through this but we've been through it ourselves.

Everyone on staff at Cornerstone Healing Center is living a life free from active addiction. We’ve helped hundreds of people find long-term, meaningful sobriety — and we can help you, too. But you have to take the next step.

Estil Wallace, Founder/CEO.  Estil has worked in the recovery field for 12 years. He has served as the organization’s’ Executive Director, Board Member and President. Estil has also worked directly with alcoholics and drug addicts inside of the Maricopa County jail system including Tent City, Lower buckeye, Durango and Towers Jail. Additionally, Estil has over 14 years of experience with inside/outside sales, management, networking and digital marketing. He believes that anyone can heal that has the willingness to change.

Marcus Clark, Executive Director/COO. Marcus has worked in the Mental Health / Substance Abuse field for over 5 years. Marcus specializes in developing and managing substance abuse and mental health programs. He has worked with Phoenix Fire and Police Departments developing processes for training, managing, community involvement and coordination between various mental health organizations. He has also worked with Pinnacle Peak Recovery, Scottsdale Providence Recovery Center, as well as three different mental health disorder programs for Community Bridges and Empact SPC.

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 D.O. FACEP 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.

Dr. Flatley also is the founder and CEO of Direct2MD, and online virtual primary care platform active in over 10 states and employing over 20 providers.

In 2020, in response to the COVID-19 pandemic, Direct2MD and Direct2Recovery combined in order to provide greater outreach and more comprehensive care to those seeking addiction treatment through telemedicine.

In 2019, Dr. Flatley became the medical director for Cornerstone healing center.  Both share and abstinence-based philosophy towards addiction as the ultimate goal, understanding that MAT may be of assistance in helping our patients reach that goal of an addiction free, happy, and safe life.

Samantha Esquivias FNP-C, PMHNP-BC, MSN, MBA. 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.

Charlene Sarraf, Primary Therapist. Char is currently working towards her licensure as a LPC. She also adds 18+ years of sobriety to our team. Her dedication to helping others has been the primary focus of her recovery. By addressing life skills, while utilizing recovery tools, she maximizes on the strengths of our clients to reach their full potential and achieves results by her direct approach. Her interests outside of recovery include hiking, tennis, meditation and time with family and friends.

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. 

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.

Paige Warren, Director of Billing. Paige has worked in the mental health and substance abuse field for over two years, after starting as a Behavioral health technician, she then started her career specializing in insurance and billing. Paige also brings over 4 years of sobriety to the team. She hopes that she can use her experience to help others suffering from substance abuse. 

Sead Hasic, Director of Business Development and Admissions. Sead began his recovery journey in August of 2014. Shortly after, he started his career in the recovery field. Sead became a resident manager at a non-profit organization in the valley that helps hundreds of men and women, daily. Sead then took his experience to Calvary Healing Center where he continued his mission of helping others.

Jenn Mullin, Director of Digital Marketing. Jenn began her recovery in 2011, and began working in the Addiction Treatment industry in 2015. She has over 5 years of Digital Marketing experience, and is passionate about using her skillset to spread hope to those struggling with addiction on a large scale. Outside of work Jenn enjoys traveling, paddleboarding, video games, and spending time with friends and family.

Anthony Tatum, Business Development. Anthony found recovery in 2012 and became passionate about helping others achieve the same relief he had experienced. In 2013 Anthony began working professionally in drug and alcoholic treatment. During the last 7 years, he has created programming schedules, policies and procedures and managed residential and transitional living facilities. Anthony believes in the ability to recover from addiction and is passionate about working to help those suffering. 

Mary Jane, Business Development. MJ brings 8 years of experience in the recovery field after having found her own personal journey out of addiction. Having worked many years in the clinical aspect of treatment with clients and their families MJ now directs her energy towards helping those afflicted with addiction find treatment options that work for them . Outside of her professional life MJ is devoted to helping women in correctional facilities find their own freedom.

Alan Weaver, Admissions Supervisor. Alan has worked in the Substance Abuse and Mental Health field for 3 years in Sober Living, Outpatient, Residential, and Detox levels of care. Alan now uses his combined experience with his own recovery and the healthcare system to help others find a new life.

Cole Armstrong, Admissions Specialist. Cole was born and raised in sunny south Florida only to start his life of recovery here in Scottsdale back in November 2018. Since then, he has traveled this road of helping others find recovery and began working at Cornerstone in January of 2020. As an alumni of the program, he hopes to share and give back the love and understanding of life that Cornerstone once gave him.

Celia Cacciotti , Office Manager. Originally from Toronto, Canada, Celia moved to the Scottsdale area in 1994 with her family to escape the cold weather. Celia has been working in the medical field for the past 8 years.  Celia’s health philosophy is “Balance is key to feeling better and living better – We should honor and tend to our mental, physical and emotional/spiritual well being.” When she isn’t helping clients or being the glue that helps keep Cornerstone together, she enjoys spending time with family and friends, cooking, visiting local farmer’s markets, and traveling.

Tom Higgins, Navigator. Tom grew up in Central New York but traded snow for sunshine and moved to Scottsdale, AZ in 2017. After finding Cornerstone in April of 2019 and beginning a life of recovery for himself, Tom has worked hard to help others discover their own pathway to recovery. Starting in October of 2020, Tom began working as the Navigator at Cornerstone guiding clients through the formative first year of sobriety.

Max Perez, Case Manager. Max has worked in the behavioral health/recovery field for 4 years and has worked with a community-based outreach team to provide services to clients who suffered from addiction as well as being chronically homeless. Max has a passion for helping those suffering from drug and alcoholic addiction and believes everyone deserves to live a life free from addiction.

Dane Perikly, Operations. Growing up in Phoenix, Az, Dane began his journey of recovery in 2016 and moved into the treatment field in late 2017 working as a call representative. Since then, he has worked in various roles at an outpatient level, both in client care and business before landing in operations with Cornerstone in 2020. With his belief that peace comes from within, he hopes to use his skillset to provide a space that is structured and calm to give those who are struggling with substance abuse the ability to grow and learn.

Eric Yunker, Operations. Eric grew up in Chicago and moved to Tempe in December of 2017 to begin his education at ASU.  He soon after began his career with Cornerstone in operations as a House Manager.

Mikey Candella, Operations. Mikey was born and raised in Phoenix, AZ. Mikey found a solution to drugs and Alcohol in April 2018. He has worked in the recovery field for most of his sobriety. Mikey is a certified yoga instructor and uses that as an outlet, helping individuals to find community, spirituality, and a healthy practice.

Dayna Kwon, Operations. Dayna thought she was coming to Arizona for just 30 days of treatment in April of 2018 and has built her new life here. Dayna has been working in the recovery field since 2019 providing sober living and aftercare for those struggling with substance use disorders. She came on board with Cornerstone Healing Center in 2021 hoping to learn and grow with us, while being a part of making a difference in people’s lives. 

Torry Yonker, Fitness Professional. Torry is a NASM certified personal trainer with 3 years experience as a fitness professional. He was born and raised in Phoenix Arizona and began his recovery journey at Cornerstone in August 2019. He also owns and operates a meal preparation company to help his client make better nutritional decisions. In his own words Torry got into the fitness industry because: “ Fitness has been instrumental in my life. It’s helped me find confidence, discipline, and a healthy outlet. All of which I lacked in my addiction. I want other to have that experience. I want to help people be the best version of themselves.”


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