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Dr. Tatum

Chief Executive Officer

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Alicia Alva

Chief Operating Officer of Mental Health Division

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Louisa Gee

Vice President of Adult Clinical Services

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Jeanne Chapman

Director of Human Resources

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Stephanie Patrick

Director of Psychiatric Services

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Megan Oliveira

Director of Business Development

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Amanda Frantz

Director of Outpatient Programs

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Aaron Vargas

Director of Residential Programs

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Garrett Johnson

 Outpatient Clinical Supervisor

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Graceson Gibson

Fresno Program Manager

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Ivan Macias

Outpatient Clinical Lead

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Brittany Garber

Aftercare Coordinator

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Serving California's Central Valley
Conditions We Treat
Anxiety
ADHD
Depression
Dual Diagnosis
Bipolar
OCD
Schizophrenia
PTSD/Trauma

Certified by the State Department of Health Care Services. Certification Number: 100011AP Expiration Date: 12/31/2025 Certification Number: 100011BP Expiration Date: 06/30/2026 Certification Number: MHBS200315 Expiration Date: 3/17/2025 Certification Number: MHBS210352 Expiration Date: 3/31/2025 Certification Number: 540060AP Exp: 12/31/2026

https://data.chhs.ca.gov/dataset/sud-recovery-treatment-facilities

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Dr. Tatum
Chief Executive Officer

Matthew Tatum, PsyD received his Doctorate in Clinical Psychology from Rosemead School of Psychology. Early in his career, he played a key role in helping develop two integrated behavioral health departments for Federally Qualified Health Centers in Fresno County. In 2015 he assumed the Executive Director role at First Steps Recovery. There he grew a single, six bed residential drug and alcohol treatment center into a six bed detoxification facility, 16 bed residential treatment center, partial hospitalization and intensive outpatient program, and 30 bed sober living program. Expanding services such as this is a passion and life’s work for Dr. Tatum. His goal for Sierra Meadows is to expand services to the entire Central Valley and be able to provide care for all those in need.

Alicia Alva
Chief Operating Officer of Mental Health Division

Alicia comes to Ascend Behavioral Health with more than 10 years of experience leading programs supporting individuals with intellectual disabilities and mental health diagnoses. After graduating with her BA in Social Work from CSU Fresno and launching her career with a national family home agency, Alicia pursued her MS in Marriage, Family and Child Therapy at University of Phoenix. Prior to joining Ascend, Alicia was the Executive Director of Operations at Central Valley Training Center, where she led behavior management and crisis response programs to success across the Central Valley. Throughout Alicia’s career, she has developed an unrelenting passion for supporting people who might otherwise go unsupported. In her free time, she enjoys spending time with her family and cheering on her two handsome young boys at their soccer games.

Louisa Gee, LMFT
Vice President of Adult Clinical Services

Louisa was born and raised in Scotland and attended the University of St. Andrews, where she earned her MA in Social Anthropology. After finishing school, she emigrated to the United States and earned her MA in Marriage, Family, and Child Counseling. She is devoted to working with attachment, grief and loss issues, and helping clients learn to accept and embrace their emotions. Her clinical orientation is Dialectical Behavioral Therapy (DBT) perspective. In her personal life, Louisa is a wife and mother of two amazing boys. She is passionate about helping people love who they are and find inner peace.

Jeanne Chapman
Director of Human Resources
Jeanne Chapman serves as Human Resources Manager at Tatum Psychology Employment Group, Inc., where she provides strategic HR leadership for a 200+ employee behavioral healthcare organization operating across multiple states. With more than 25 years of progressive HR and operations experience, Jeanne oversees all aspects of talent acquisition, employee relations, compliance, benefits, training, and organizational development. She advises executive leadership on workforce strategy, regulatory compliance, and risk management, including the implementation and maintenance of the company’s commercial and health insurance programs, as well as contract negotiations for a self-funded healthcare captive plan.
Prior to joining Tatum, Jeanne held HR leadership roles in healthcare, government, utilities, and private industry, managing teams as large as 520 employees. She holds multiple professional certifications through the University of California, Davis, in Human Services Supervision, Civil Rights, and Employment Law, as well as OSHA, FEMA, and safety compliance training. Known for her strong leadership, problem-solving skills, and collaborative approach, Jeanne is dedicated to building compliant, people-focused workplaces that support both employees and organizational growth.
Stephanie Patrick
Director of Psychiatric Services

Stephanie Patrick-Calvillo, MSN, PMHNP-BC is a Board Certified Psychiatric Mental Health Nurse Practitioner, with training and experience treating patients with psychiatric disorders across the lifespan and across practice environments; including inpatient and outpatient settings. Her education includes a Master of Science in Nursing degree with a focus on Executive Healthcare as well as a Psychiatric Mental Health Nurse Practitioner specialization from the University of St. Louis. Stephanie provides personalized, compassionate, and comprehensive care for patients. When not caring for patients Stephanie enjoys spending time with her family, traveling, and collecting plants.

Megan Oliveira
Director of Business Development

Megan comes to Sierra Meadows with over a decade of experience working in strategic development and social impact in the non-profit, NGO, and foreign aid sector. She was a film producer at MSNBC and produced documentary and docu-series projects during her time there. Megan has a passion for helping underserved communities access the mental health and recovery resources they need.  She is a graduate of the University of San Diego with a bachelor’s degree in Rhetoric and a minor in Business Administration, she also lettered in Division 1 Soccer while at USD. She was born and raised in Central California and is returning to the area after working in the Bay Area and Los Angeles for the last 20 years. She values spending time with her family and weekend trips to Shaver Lake.

Amanda Frantz, MSW
Director of Outpatient Programs
Amanda Frantz serves as the Director of Outpatient Programs at Sierra Meadows Behavioral Health, bringing with her a rich background in clinical care and program leadership. Holding a Master’s degree in Social Work, Amanda is deeply dedicated to supporting individuals facing mental health and substance use challenges, always striving to uphold the dignity and well-being of those in her care.
 
Before joining Sierra Meadows, Amanda was the Program Manager at Eminence Healthcare, where she focused on adolescent substance abuse treatment. Her steadfast commitment to helping youth overcome addiction earned her the trust of families and the admiration of her peers.
 
Beyond her professional accomplishments, Amanda is a devoted wife and mother. She treasures quiet evenings at home, embracing the simple joys of family life and the responsibilities that come with raising children.
 
Amanda’s steady leadership, clinical insight, and heartfelt compassion continue to shape the work being done at Sierra Meadows, contributing to meaningful, lasting change in the lives of those they serve.
Aaron Vargas
Director of Residential Programs
Aaron Vargas has earned his Master of Arts in Educational Counseling from National University and a Bachelors in Criminology from CSU Fresno. Aaron comes to Sierra Meadows as Director of Residential Programs, where he has helped establish the treatment of new programs. Throughout Aaron’s career he has supported patients and his fellow staff through behavioral and crisis management and has a passion for helping adolescents in need. On his free time, Aaron is a family man and enjoys to watch his son play football and wrestle.
Garrett Johnson
Outpatient Clinical Supervisor
Garrett Johnson is a Licensed Professional Clinical Counselor and Clinical Supervisor for the Sierra Meadows Behavioral Health Partial Hospitalization Program and Intensive Outpatient Program. He is fully EMDR trained and specializes in Dialectical Behavioral Therapy. With five years of experience in the field, Garrett has a strong passion for providing this level of care.
Graceson Gibson, ACSW
Outpatient Program Manager

Graceson holds a BA in Psychology and a MSW from California Baptist University. Graceson started with Sierra Meadows as an ACSW and was promoted to Program Manager on her one-year anniversary with the company. Graceson has always had a passion to help people and she loves being able to support her team and promote an environment that encourages collaboration and communication. Outside of her role, Graceson enjoys spending time with her husband and dog, going on adventures, and eating good food.

Ivan Macias
Outpatient Clinical Lead
Ivan Macias is a Clinical Supervisor at Sierra Meadows Behavioral Health and a self-appointed supervisor of morale. He holds a master’s degree in Marriage, Family, and Child Counseling, and a second master’s degree in Kinesiology: Sport Psychology. Ivan takes a person-centered approach in therapy and values providing excellent clinical care. Outside of work, he has visited every major league baseball ballpark and proudly holds an executive Costco membership.
Brittany Garber
Aftercare Coordinator
Brittany Garber earned a BA in Psychology and Anthropology and has extensive experience in behavioral health. Her primary career goal is to support individuals navigating mental health challenges, addictions, and disabilities. Working as both an alcohol and drug counselor and a discharge coordinator at CRMC strengthened her commitment to compassionate, effective care and allowed her to build connections with programs that address all aspects of patients’ needs. In her current role as Aftercare Coordinator, Brittany helps clients access therapy, psychiatry, medical care, support groups, and other essential resources to promote lasting recovery and overall well-being. Outside of work, she enjoys rehabilitating and adopting pets, reading, and playing board games with friends.
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