Executive Leadership Team

Nick Stavros

Chief Executive Officer

Nick Stavros, a seasoned leader and CEO of Community Medical Services, blends military expertise, academic achievement, and healthcare advocacy in his impactful 10-year tenure.

David Thurlow

Chief Growth Officer

In January 2023, David Thurlow assumed the role of CMS's inaugural Chief Growth Officer, spearheading expansion initiatives with a strategic vision shaped by over two decades of business development experience.

Dr. Robert Sherrick, M.D. FASAM

Chief Science Officer

Dr. Robert Sherrick, CMS's inaugural Chief Science Officer since 2023, brings a wealth of experience in addiction treatment, Medication Assisted Treatment, and leadership in addiction medicine.

Christopher Flowers

Chief Operating Officer

Christopher Flowers, the newly appointed Chief Operating Officer at CMS since January 2024, brings over 15 years of operations expertise.

Michael Hailye

Chief Technology Officer

Appointed as the first Chief Technology Officer in 2022, Michael Hailye oversees CMS's IT landscape and facility maintenance support. His diverse expertise spans aerospace engineering to executive leadership in behavioral health services.

Jennifer Mason

Executive Vice President of Operations

Jennifer Mason, a healthcare veteran, ascended to Executive Vice President at CMS in 2022. Her strategic leadership elevated CMS to a prominent role in the MAT/MOUD space.

Mark Stavros, M.D.

Medical Director, Western Territory

Dr. Mark Stavros, CMS's Western Territory Medical Director, combines extensive experience in Emergency and Addiction Medicine, education leadership, and advocacy for evidence-based addiction treatment.

Daniel Gutschenritter

Chief Financial Officer

Daniel Gutschenritter, the newly appointed Chief Financial Officer at CMS since July 2023, brings three decades of financial healthcare expertise, notably steering Baymark Health Services' remarkable expansion.

Stacie Baird

Chief People Officer

Since 2022, Stacie Baird, Chief People Officer at CMS, has led transformative change, championing human experience in HR. Her impactful journey spans start-ups to large corporations.

Hillary Tamar, M.D.

Medical Director, Eastern Territory

Dr. Hillary Tamar, CMS's Eastern Territory Medical Director since 2023, brings a wealth of expertise in addiction medicine, patient care, and medical education.

Nick Stavros, Chief Executive Officer

Nick Stavros is the CEO of Community Medical Services, where he has worked for the past 10 years. Previously, Nick was an intelligence analyst and Arabic linguist in the U.S. Army and finished his military career as an Airborne/Ranger-qualified Infantry Captain and Iraq War veteran. Upon honorably discharging from the Army, Nick received his MBA from the UCLA Anderson School of Management and is an alumnus of the Arizona Valley Leadership Institute. Nick is on the board of the National Association for Behavioral Health (NABH) and chairs its Medication Sub-committee. He is also the Arizona representative to the American Association of the Treatment of Opioid Dependence (AATOD) and the president of the Arizona Chapter of AATOD, which provides collaborative opportunities for facilities throughout the state. Nick is also on the ASU Medical Advisory Board, AZ Parent’s Commission on Drug Education & Prevention with the AZ Governor’s office, an Advisory Board Member of the National Conference on Addiction Disorders and a board member for HMP’s Treatment Center Investment & Valuation Retreat (East & West).

Daniel Gutschenritter, Chief Financial Officer

Daniel Gutschenritter joined CMS in July 2023 as the company’s Chief Financial Officer. Dan has worked for nearly 30 years in senior financial healthcare management including 9 years as the CFO for Baymark Health Services. During his tenure with Baymark, he oversaw the growth from 4 treatment clinics to over 200 clinics in the US and Canada. Dan holds an undergraduate degree in Finance and Marketing from the University of Wisconsin – Madison, and a Masters degree in Finance and Accounting from Duke University’s Fuqua School of Business.

Christopher Flowers, Chief Operating Officer

Chris joined CMS in January 2024 as Chief Operating Officer. He has been a leader in the operations industry for over 15 years and prides himself on his ability to develop successful management teams and improve processes. Chris focuses on personal development, improving underperforming service operations, and boosting employee engagement. He attended Texas Tech University where he got his master’s degree in Business Administration and his bachelor’s degree in Restaurant and Hospitality Management. In his free time, Chris loves to spend time with his wife, kids, and their schnauzer, Opie.

David Thurlow, Chief Growth Officer

David Thurlow was appointed as CMS’s first Chief Growth Officer in January 2023 to lead the company’s expansion efforts into new markets and their portfolio of treatment services. David earned a Bachelor of Business Administration from the University of Michigan and a Master of Business Administration from the Stanford Graduate School of Business. David has over 20 years of experience in business development, strategy and operations, including serving as Vice President of Healthcare Value Proposition at Walgreens, where he helped advance Walgreens’ strategy for working collaboratively with health systems and payer organizations.

Michael Hailye, Certified Information Systems Security Professional (CISSP), Chief Technology Officer

Michael was appointed as the company’s first Chief Technology Officer in March 2022, leading the information technology team and external vendor relationships. He is responsible for Applications development and support, Data analytics and data integrations, Cybersecurity risk management, IT Infrastructure management and IT Service Desk support for all CMS employees and contractors. During March 2023, Michael also took leadership of the CMS Facilities Maintenance Support Team providing coordination of maintenance & repair vendors, suppliers, and the opening of new clinics. Michael holds a BS degree in Aeronautical Engineering from Rensselaer Polytechnic Institute, and a Master of Engineering degree in Aerospace Engineering from the University of Michigan, starting his career in research and engineering then transitioning to serve as an officer in the United States Air Force. Following his service, he led teams providing Information Technology Risk Management and Cybersecurity services with Ernst & Young LLC. He has held multiple CIO executive leadership positions within the Behavioral Health services industry, providing innovative and cost-effective applications to offer the most effective behavioral health treatment services and outcomes to patients.

Stacie Baird, Chief People Officer

Stacie Baird has been with CMS since 2022 as Chief People Officer, overseeing the Employee Experience Team (EXT) leading change across a highly distributed workforce with a strong purpose to impact the lives of patients and solve this public health crisis. Driven by purpose and focused on building foundational trust, Stacie has found her way through multiple successful start-ups, high-growth environments, and large public company environments. Specializing in leading innovative HR teams that are highly aligned to having a measurable business impact, she is passionate about the movement from HR to the next generation of HX, or a focus on Human Experience. EXT is the problem-solving team that focuses on the HX of candidates, employees, and partnerships. This team works across the business to focus on the very real human challenges employees navigate each day and look for human centric solutions elevate that experience. Stacie has a BS in Chemistry with a focus in Pharmacology from Butler University.

Dr. Robert Sherrick, MD, FASAM, Chief Science Officer

Dr. Robert Sherrick was appointed as CMS’s first Chief Science Officer in 2023, transitioning from Chief Medical Officer, a role he served for 6 years. Prior to serving CMS he had experience working at an inpatient addiction treatment facility in Montana, Pathways Treatment Center, treating all forms of Substance Use Disorders and dual diagnosis patients. Dr. Sherrick has been providing Medication Assisted Treatment for Opioid Use Disorder since 2003, initially in an office setting using buprenorphine and subsequently with methadone in Opioid Treatment Programs. He established a state-wide buprenorphine treatment program for VA Montana with an extensive focus on telemedicine. He is board certified in Addiction Medicine through the American Board of Preventative Medicine and is the Immediate Past President of the Northwest Chapter of the American Society of Addiction Medicine. Dr. Sherrick received his MS and BS degrees in Electrical Engineering from the Massachusetts Institute of Technology, and his MD from George Washington University Medical Center.

Jennifer Mason, Executive Vice President of Operations

Jenn Mason is a seasoned healthcare leader with over 20 years of experience in the MAT/MOUD space. Jenn joined CMS in 2015 and has served in several roles during her tenure, and was promoted in 2022 to her current role of Executive Vice President where she oversees all clinical operations currently serving 20,000 patients in 65 clinics that span 10 states. Her leadership has been instrumental in the growth strategy that has transformed CMS into a leader in the MAT space, deploying strategic and tactical operations for the first 24/7 OTP, which CMS has replicated across the country into the opioid treatment on-demand model. She also played a significant role in executing several acquisitions which led to additional expansion into new markets. Jenn has been a nurse for over 20. Years and holds a degree in Business with an emphasis on Organizational Leadership from Southern New Hampshire University.

Hillary Tamar, M.D., Medical Director, Eastern Territory

Dr. Hillary Tamar is the Medical Director of CMS’s Eastern Territory, and oversees the delivery of gold standard, evidence-based medical care in Ohio, Texas, Indiana, Michigan, Wisconsin and Minnesota. Along with Dr. Stavros and Dr. Sherrick, she serves on CMS’s Medical Advisory Board. She started with CMS in 2021 and entered her current role in 2023. Alongside her administrative duties, Dr. Tamar loves providing direct patient care at multiple CMS clinics. She completed a fellowship in Addiction Medicine at Swedish Medical Center, in Seattle, WA, and is board certified in both Family Medicine and Addiction Medicine. Prior to her post-graduate medical training, Dr. Tamar received her B.S. in Biomedical Science from Marquette University and her M.D. from Chicago Medical School. Dr. Tamar is a passionate presenter and has special interests in both medical education and the treatment of pregnant patients with substance use disorders. Before her time with CMS, Dr. Tamar was a presenter on the American Family Physician (AFP) podcast.

Mark Stavros, M.D., Medical Director, Western Territory

Dr. Mark Stavros serves as the Medical Director for the Western Territory of CMS. He along with Dr. Sherrick and Dr. Tamar serve on CMS’s Medical Advisory Board. He is board certified in both Emergency and Addiction Medicine. Dr. Stavros was awarded the Air Force Health Professions Scholarship and received his Medical Degree at Creighton University. He completed his residency in Emergency Medicine at St. Vincent’s Emergency Medicine Residency Program in Ohio. He has worked as an emergency physician in the panhandle of Florida for the past 26 years and served as the Emergency Department medical director for West Florida Hospital and its associated free-standing Emergency Departments for the past 9 years. Dr. Stavros is an associate clinical professor at Florida State University College of Medicine. He serves as both Education and Clerkship Director of Emergency Medicine for Florida State University.

He is medical director of Gulf Coast Addiction Medicine in Florida focused on the treatment of patients in the community and in jail dealing with addiction. Dr. Stavros has practiced addiction medicine for 12 years and has served as CMO for Maric Healthcare serving patients struggling with addiction. He is a peer mentor for the State of Florida charged with educating recovery programs on the use of medication assisted treatment in addiction medicine.

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