Mon. – Fri. 8AM – 8PM.  Sat. 9AM – 6PM

Managment Team

Sharon J. Alvis
President & CEO

Sharon Alvis is a thought leader and high-performing executive with experience bringing healthcare products to market. She delivers a comprehensive understanding of the complex interactions of providers, payers, and patients, and can assist innovative companies that are redefining the status quo by navigating the nuances of the industry. Her career trajectory has been marked by serving in senior management positions with health plans, hospitals, and physician organizations, including holding primary responsibility for multiple start-ups and successfully leading HMOs, PPOs, a Physician Hospital Organization (PHO), and an EAP. She served as President of Vista360health, an HMO, and as Regional VP – Texas & Louisiana for a Medicare Advantage Plan. She was also CEO of a PHO representing 450 physicians and 3 unaffiliated hospitals. Sharon brings expertise in understanding the delivery system and the motivators of these various industry participants and stakeholders.

Before joining Sendero Health Plans, Sharon served as Market President for Curative Insurance Company, where she led the development of a new PPO fully insured product catering to large employers.

She spent her early career in business development and executive leadership roles for various health systems and start-ups, working extensively with managed care products. She is a member of the Austin Healthcare Council and is Licensed by the Texas Dept. of Insurance as a General Lines Agent – Life, Accident, Health & HMO.

Tierra Thomas, MHA
Chief Operations Officer

Tierra Thomas joined Central Health in February 2010 as an Administrative Assistant after relocating from Kansas City, Missouri to Austin, Texas. When Central Health created Sendero Health Plans, Inc., a Health Maintenance Organization (HMO), Tierra decided to join the new company as a Provider Network Representative. After her assistance with building a Provider Network for the Medicaid and CHIP programs, Tierra moved on to Member Services where she helped build a team to help resolve member and provider concerns. In 2014, she transitioned to Vendor Relations and gained the expertise to obtain the Senior Director of Operations position. 

Tierra has a B.S. Degree in Criminal Justice with an emphasis in Administration from Missouri Western, and a Master’s Degree in Healthcare Administration from the University of Phoenix. 

In 2019, Tierra was named Sendero’s Chief Operating Officer. Her performance in all roles have been key in navigating Sendero through the years.

Dr. Mary Carol Jennings, MD, MPH
Chief Medical Officer

Mary Carol Jennings, MD, MPH is the new chief medical officer of Sendero Health Plans, where she will contribute to our mission of delivering high-quality, equitable health care to the County’s under-served and uninsured. A board-certified preventive medicine physician with a special focus on communicable disease prevention and health equity, Dr. Jennings grew up in small-town rural South Carolina. She joins Sendero’s executive leadership team from the faculty of the Johns Hopkins Bloomberg School of Public Health, where she directed international research and policy initiatives across multiple departments, and served as a core faculty member and Academic Director of the school’s preventive medicine residency training program. 

Dr. Jennings’ implementation research and public health practice focuses on using theoretical frameworks of participation and community organizing to engage the end-user in improving vaccine and health service delivery programs, with special attention on serving neglected and low-resourced populations. For the past 4 years she ran a multi-country vaccine access collaborative in partnership with the U.S. CDC and the US-based global NGO, JSI, and she most recently served as the Director of Reproductive and Maternal Health Initiatives for the school’s International Vaccine Access Center. 

Dr. Jennings completed her undergraduate degree in neuroscience from the College of William & Mary and received her medical degree from the University of South Carolina, where she focused on rural medicine and primary care. She completed two years of clinical training in obstetrics and gynecology before leaving to serve as a senior fellow in women’s health for a policy think tank based in Washington, DC, overseeing regulatory and safety programs and initiatives. She went on to complete a residency in preventive medicine and obtained a master of public health degree from the Johns Hopkins Bloomberg School of Public Health, where she continues to serve on the faculty and as an advisor on community health and disease prevention issues. 

Dr. Jennings joined Sendero as Chief Medical Officer in July 2020.

Elizabeth Barreneche
Chief Financial Officer

Elizabeth Barreneche joined Sendero Health Plans in August of 2013 as an Accounting Assistant after relocating from Canada. She holds a BS in Accounting and has leveraged her financial experience to work her way up through the company developing a deep understanding of managing plan financials. 

Ms. Barreneche was named Chief Financial Officer for Sendero Health Plans in 2016.

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*This amount was announced in June 2022.