Staff members at San Marcos Treatment Center are highly trained and experienced. We provide a 40-hour orientation, and staff with direct care contact and responsibility are required to complete at least 50 hours of training each year. This includes clinical therapists, nurses, mental health associates and other professionals.
We provide access to online training modules designed to keep skills sharp. There is extensive longevity across all areas at the facility with many staff having been part of the team for 10, 20 and even 30 years. We are committed to making a difference in the lives of children and families we serve.
If you are interested in becoming a member of our staff, browse through our open positions.
Mack Wigley, LPC-S, NCC – Chief Executive Officer
Mack Wigley is the Chief Executive Officer and managing director of San Marcos Treatment Center.
Mr. Wigley has dedicated more than 40 years of his professional life to the treatment of mental health and educational needs of children and their families. He operates on the premise that the family is the unifying foundation of health and strength required for continued personal growth.
Mr. Wigley began his career in 1977 as a mental health worker with the Brown Schools (later San Marcos Treatment Center), and has experience at all levels of behavioral health and acute care organizations—including direct care, ROPES, clinical care and executive leadership. He received his Bachelor of Science degree in Psychology in 1974 from Southwest Texas State University. He earned his Master of Education in Counseling and Guidance with special emphasis on school psychology from Southwest Texas State University in 1979. He has been licensed for 30 years as a Licensed Professional Counselor-Supervisor as well as a Marriage and Family Therapist in the State of Texas. He is also certified by the National Board of Certified Counselors, is Board Certified as a PTSD Clinician and is certified in Neurosequential Model of Therapeutics.
Mr. Wigley served on the Board for the National Association of Psychiatric Treatment Centers, an organization that lobbied in support of children’s and adolescents’ needs for mental health
His past presentations and workshops include Systemic Approaches to Family Therapy, Solution-Focused Therapy, Trauma Informed Therapies, Treatment of Borderline Personality Organization and other Characterological Disorders, Various Experiential Therapies, and The Development of Organizational Culture in Mental Health Settings.
Mack has served as San Marcos Treatment Center’s CEO since 2014, and is currently in his second tenure at the facility, having previously held the position from 1994 through 2001.
Jerry Magnison, CPA – Chief Financial Officer
Jerry Magnison, CPA is the Chief Financial Officer of San Marcos Treatment Center, having joining the Team in December 2015. He is responsible for all aspects of the facility’s financial operations.
Mr. Magnison has over 35 years of experience as a CFO in the healthcare field and with various CPA firms in Minnesota. He also has additional experience with for-profit and non-profit organizations; corporate, city-owned and state-owned operations; and medical/surgical and specialty/behavioral health hospitals. He received his accounting degree from California Polytechnic University of California.
John Rust, M.D. – Executive Medical Director
John Rust, M.D. is the Executive Medical Director of San Marcos Treatment Center. In this role he supervises the medical and treatment teams at the facility. He also directly oversees the treatment of patients in his care on our New Heights and Gateway units. Dr. Rust is a licensed Child and Adolescent Psychiatrist.
Dr. Rust graduated from the UT Medical Branch-Galveston in 1973 and is licensed in Texas. He has been with San Marcos for 28 years and has effectively treated patients with a wide variety of diagnoses.
Johnnie Fisher, M.D. – Unit Medical Director
Johnnie Fisher, M.D. is a Unit Medical Director at San Marcos Treatment Center. In this role he directly oversees the treatment of patients in his care on our Clearview and Gateway units.
Dr. Fisher graduated from the UT Medical Branch-Galveston in 1970, and was licensed in Texas the same year. He previously worked at hospitals in San Antonio and Victoria, Texas. He is board certified in Psychiatry by the American Board of Psychiatry and Neurology.
Joseph Simpson, M.D. – Unit Medical Director
Joseph Simpson, M.D. is a Unit Medical Director at San Marcos Treatment Center. In this role he directly oversees the treatment of patients assigned to his care on our New Horizons unit. Dr. Simpson has worked with youth at our facility for over 33 years.
Dr. Simpson graduated from the UT Medical Branch-Galveston in 1973 and was licensed in Texas the same year.
Lakshmi Kaza, M.D. – Unit Medical Director
Lakshmi Kaza, M.D. has served as a Unit Medical Director at San Marcos Treatment Center since 2017. In this role, she directly oversees the treatment of patients assigned to her care on our Springhill unit. She is board certified in Child and Adolescent Psychiatry by the American Board of Psychiatry and Neurology.
Dr. Kaza completed her residency at Oklahoma University Health Sciences Center and was licensed in Texas in 2006. She has previously worked at Waco Center for Youth as Medical Director.
Shephali Sharma, M.D. – Unit Medical Director
Shephali Sharma, M.D. has served as a Unit Medical Director at San Marcos Treatment Center since 2017. In this role she directly oversees the treatment of patients assigned to her care on our Springhill and Gateway units. She is board certified in Psychiatry as well as Child and Adolescent Psychiatry by the American Board of Psychiatry and Neurology.
Dr. Sharma completed her residency at Jamaica Hospital Medical Center in New York, and was licensed in Texas in 2013. She previously worked at Cedar Crest Hospital as Medical Director.
Deidre Brown-Averyt, RN – Director of Nursing
Deidre Brown-Averyt is the Director of Nursing at San Marcos Treatment Center. She is responsible for the nursing services for all San Marcos patients. She actively promotes a culture of safety and demands a high standard of care. Deidre is licensed as an RN in Texas, and our nurses are served by her hands-on leadership as well as her commitment to quality and detail.
Christie Greeley, LPC-S – Director of Clinical Services
As Director of Clinical Services, Christie Greeley is responsible for the facility’s clinical therapists and the therapeutic treatment delivered to patients. This includes individual, family and group therapy as well as ROPES and other activities.
Webster Averyt, LCCA – Child Care Administrator | Director of Performance Improvement
As Director of Performance Improvement, Webster Averyt is responsible for the facility’s performance improvement activities, which include regular review of various aspects of patient care as well as designing and implementing new and innovative strategies to further enhance the quality of care each patient experiences.
Richard Sears, M. Ed, LPC-S, LSOTP – Director of Clinical Care Management Systems
Richard Sears is the Director of Clinical Care Management Systems at San Marcos Treatment Center. He is responsible for the management and supervision of the medical records department and utilization review. He joined San Marcos Treatment Center in 2010 and brings a wealth of experience with varied clinical and management roles, including over 20 years in acute and residential centers, outpatient services and as a consultant to many programs and facilities in the Northeast and Northwest United States and Guam. His work has included children, adolescents, adults, couples, families and with sex abuse/trauma victims and offenders.
Richard utilizes systemic approach in the treatment process, which is also reflected in his leadership style. He is a seasoned clinician and strong advocate for mental health services in his community. He has a passion for building resources, improving processes and creating positive patient outcomes.
Richard is experienced in using multiple therapeutic modalities to help patients, including, solution-focused therapy, cognitive-based therapy and Dialectical Behavioral Therapy (DBT) for adolescents and adults. He is a Texas native and completed his Master’s degree at The University of North Texas, obtaining his licensing credentials in 1988.
Sherri Gonzalez, MBA – Director of Business Development
Sherri Gonzalez has over 28 years of experience at San Marcos Treatment Center. In her current role as Director of Business Development, Sherri oversees marketing and strategic partnerships as well as leading the facility’s sales team. She leads her staff on effective targeting and messaging, anticipating market changes, building strong referral relationships, tracking sales cycles, and effectively managing sales territories. She also manages the hospital’s relationship with insurance companies, handling contracting, credentialing, and negotiating rate increases with all payers.
A native of Texas, she received her Bachelor of Business Administration in 1986 and her M.B.A. in 1996 from Texas State University.
David Tjandrasa, M. Ed. – Academic Program Director | Unit Director
David Tjandrasa began working at San Marcos Treatment Center in 2008 as a direct care staff, before transitioning to teaching at the facility’s contracted school. He returned to the facility as a Unit Manager in 2013 and was named the Unit Director and Academic Program Director in 2015.
As the Unit Director, Mr. Tjandrasa has direct oversight of direct care staff and patient care. His role as the Academic Program Director allows him to work directly with the facility’s school to assist with the needs of their staff and patients.
He grew up in Houston, Texas. He graduated from Texas State University with a Bachelor’s degree in Criminal Justice in 2008 and completed his Master’s degree in Educational Leadership there in 2015.
Gilbert Sanchez – Director of Plant Operations | Safety Officer
Gilbert Sanchez has been working at San Marcos Treatment Center for 40 years, beginning as a mental health associate in October of 1978. During the course of his employment he has served in various positions, and operates currently as the Director of Plant Operations. He oversees the facilities support services departments including facility administrative officers, maintenance and housekeeping. He also serves as the facility’s Safety Officer.
With a campus spanning 65 acres and 23 different buildings, Mr. Sanchez and his departments undertake the huge task of keeping the facility operational and within the standards and guidelines of numerous monitoring agencies and organizations. Since joining San Marcos, he has always approached his work with a “whatever it takes, can do” attitude.
Robin Cunningham – Director of Human Resources
Robin Cunningham supervises San Marcos Treatment Center’s human resources department. Ms. Cunningham is responsible for hiring, staff benefits and other related concerns. She is also the facility’s Service Excellence champion, trains new and current staff and maintains and promotes a culture of creating positive moments for patients and families.
Zach Franks – Risk Manager
Zach Franks joined the staff at San Marcos Treatment Center in 1995. As Risk Manager, Mr. Franks oversees the facility’s risk management program, which is concerned with all aspects of safety and care for patients, staff and visitors. This includes environmental issues on campus as well as behavioral interventions and other risk-related issues.
A native of San Antonio, he graduated from Southwest Texas State University in 2001 with a Bachelor’s degree in Technology.
Robert Rodriguez, M.S. Ed., BCBA, LCCA – Child Care Administrator | Behavioral Analyst
As Child Care Administrator, Robert Rodriguez is responsible for the facility’s compliance to all state regulations concerning child care operations. He is also the facility’s certified behavioral analyst and specializes in designing strategies and interactions to positively impact our patients on the milieu as well as skills and strategies patients can take back to their home communities.
Michael New – Contract and Administrative Specialist
Mike New is the Contract and Administrative Specialist for San Marcos Treatment Center. He joined the team in 2009. In his current role, Mike oversees professional and vendor contracting and credentialing. He also is responsible for the facility’s administrative support team, including administrative assistants and front desk staff.
An Austin native, Mike received his bachelor’s degree in History from the University of Texas at Austin. Before coming to San Marcos, he worked for over 10 years in environmental engineering, digital 3D contaminant modeling and archival research, as well as for the State of Texas in Law Enforcement Licensing.