Premium Service by Board-Certified Professionals

Meet the Headlands ATS Team of Specialists
We service addiction and mental health programs with care, professionalism, and unmatched expertise.

Expertise, at Your Service

Combining Specialization with Convenience

Headlands ATS aims to change lives by transforming the way treatment programs serve their patients. We provide our partnering facilities the resources, the services, and, most importantly, the people they need to foster successful recovery programs.

We unite the best and brightest medical professionals around the common purpose of helping patients on their addiction recovery journey.

Our board-certified providers specialize in highly-effective, evidence-backed rehabilitation services, emphasizing appropriate medication, mental health, and recovery management.

Every Headlands ATS team member prides themselves in a cooperative approach to patient care and a dedication to outstanding service. We treat our partnering facilities and patients the same: with reliability, respect, and genuine care for doing the right thing the right way.

Our solution? We help treatment programs grow their suite of medical services while providing optimum support and reliable teammates.

Our Values

Guide Everything We Do
Headlands ATS believes in succeeding by embodying our values. Treatment programs can save patients’ lives when they are empowered to help in any way needed.
Every member of our team stands for:

Health

Everybody deserves the opportunity for a complete life centered around positive habits and holistic health.

Service

We exist to support the goals of our partnering facilities and their patients.

Relationships

You can’t succeed without other people. We treat our partners with respect and strive to have positive working relationships.

Efficiency

In a complex industry, we work strategically to simplify.

Our Credentials and Experience

Will Take Your Program to the Next Level

With over 70 years of combined experience, 20 master certifications, and a team of physicians nationally credentialed by the Physicians Board in Addiction Medicine and Psychiatry, our team is ready and able to transform your treatment program.

Our entire team of specialists has experience providing addiction, psychiatric, and primary care. This experience means that our team is readily available to address any patient needs that arise day-to-day. Our providers are capable of diagnosing and treating a broad spectrum of conditions.

We are experts in the field of addiction medicine and psychiatry.
We are up to date on the latest evidence-based treatment modalities and routinely offer these treatments to patients under our care. With our ample experience, we can treat patients of virtually all complexities.

Meet Our Team of Specialists

Decades of Specialized Experience

Chris Small, M.D

Addiction Psychiatrist, President Headlands ATS

Jena Horn, BBA

Operations Manager

Amanda Ghamsari, BSN

Weekend Triage Nurse

Mari Hanson, PA-C

Physician Assistant CAQ Psychiatry

Kelly Mullins, PMHNP

Advanced Practice Supervisor

Diana Pasquarello, PA

Physician Assistant

Olga Jackson, FNP-BC

Family Health Nurse Practitioner

Megan Duggins, SHRM-CP

Human Resources Manager

Halee Fullerton, PMHNP

Psychiatric Nurse Practitioner

Debra Lloyd, PMHNP

Psychiatric Nurse Practitioner

Jordan Wong, PA

Physician Assistant

Ian Johnson, MD

Physician

John Hosley, PA

Physician Assistant

Carrie Starkey

Office Associate

Dr. LaFrenierre

Psychiatry Director

Jamie Guthrie RN, MSN, APRN-CNP

Learn How We Can Help You

We Are Ready to Talk

Your treatment program needs to offer the most up-to-date and proven treatments to serve your patients in their best interest properly. More than ever before, our team of specialists has the resources and information to heal people from addiction. Psychiatric care and hands-on treatment plans allow patients to rehabilitate while reducing discomfort and mental health obstacles.

The right services administered by the right people are invaluable to every one of your patient’s journeys. If you want to build a healthy partnership with hardworking, service-minded professionals to change your patient’s lives, call us today.

Chris Small, M.D

Addiction Psychiatrist, President Headlands ATS
Dr. Small received his medical degree at the University of Hawaii. He completed his medical residency in Psychiatry and Family Medicine at UCSD. He is board certified in Psychiatry, Addiction Medicine, and Family Medicine. Dr. Small is passionate about bringing quality care to patients suffering with addiction.

Jena Horn, BBA

Operations Manager
Jena has several years of experience in operations, human resources, business administration and management. She is a graduate of the Univerity of New Mexico. She brings excellent customer service, organization, and liaison/support to our program partners every day.

Amanda Ghamsari, BSN

Weekend Triage Nurse

Amanda completed her nursing degree at the University of Louisiana at Lafayette. She has a decade of experience in the field of nursing ranging from chemical dependency, mental health, neurology, and occupational medicine

Mari Hanson, PA-C

Physician Assistant CAQ Psychiatry
Mari has 19 years of experience as a Physician Assistant. She has a diverse background in medicine which includes Primary Care, Integrative Medicine, Psychiatry and Addiction medicine and Hepatitis C treatment. She graduated from Red Rocks Community College Physician Assistant program in Lakewood, Colorado in 2001. She obtained her Certificate of Added Qualification in Psychiatry in 2020.

Kelly Mullins, PMHNP

Advanced Practice Supervisor
Kelly has a long history of service. She served as an Army Healthcare Specialist and medic in Iraq and Honduras and as an RN at UCSD prior to achieving her designation as a Family Nurse Practitioner from Azusa Pacific University and Psychiatric Family Nurse Practitioner at University of Cincinnati. She has extensive experience in primary care, psychiatry and addiction medicine.

Diana Pasquarello, PA

Physician Assistant
Diana has 17 years of experience as a Physician Assistant in primary care and addiction medicine. Diana completed her undergraduate degree at UCSD and received her Master’s in Physician Assistant in 2003 from USC. She is passionate about improving access to Medication Assistant Treatment (MAT) in patients suffering from opiate dependence.

Olga Jackson, FNP-BC

Family Health Nurse Practitioner
Olga has 10 years of nursing experience, receiving her RN in 2011 and Family Nurse Practitioner designation in 2018 from South University. She has extensive experience in behavioral health and addiction medicine. She is currently participating in her clinical requirements for PMHNP designation.

Megan Duggins, SHRM-CP

Human Resources Manager
Megan brings to Headlands extensive experience as a human resources representative at the University of Chicago and as an advocate/outreach director for disadvantaged children. She holds a masters degree in Industrial Organizational Psychology from Emporia State University.

Halee Fullerton, PMHNP

Psychiatric Nurse Practitioner
Halee obtained her nursing at the University of Texas at Arlington, and her masters in psychiatric nursing in 2018 at the University of Missouri- Kansas City. Her nursing experience includes 8 years of ER, ICU, med-surg, and dementia unit service. Prior to joining Headlands, Halee provided psychiatric services in the community health setting for children, adolescents and adults.

Debra Lloyd, PMHNP

Psychiatric Nurse Practitioner
Debra has devoted her entire nursing career to working with psychiatric and chemically dependent patients. She is a graduate of Mount St. Mary’s college and received her Masters degree at Maryville University. In addition to her certification as a psychiatric nurse practitioner, Debra carries certifications in addiction nursing (CARN) and public health nursing (PHN).

Jordan Wong, PA

Physician Assistant
Jordan has experience in emergency medicine, primary care, and addiction medicine. He has been working in addiction medicine since 2011. Born and raised in NYC, Jordan has always had a heart for working with the under-served population. He became a National Health Service Corps scholar who worked in Opioid Treatment Program in the Bronx. Jordan provided medication assisted treatment and primary care services including HIV and Hep C Treatment.

Ian Johnson, MD

Physician
Dr. Johnson received his medical degree from the State University of New York Upstate Medical Center. He is board certified in Family Medicine and board eligible in Addiction Medicine. Dr. Johnson has had a varied career which includes services as a flight surgeon in the US Air Force and a combat life support instructor in the US Army Reserves. In civilian practice he has served as medical director at community clinics and at various substance abuse detox and residential facilities. Dr. Johnson is the founder of Archway Healthcare Services. He has a passion for quality assurance and quality improvement at all levels of client care.

Dr. Apollo

Dr. Sarah Apollo graduated University of Health Sciences here in Southern California at the top of her class earning The Who’s Who recognition Award and completed her residency at UC Davis Medical Center. Dr. Apollos is board certified in Addiction Medicine and Family Medicine, and also certified in Botox and filler procedures. She has been in practice since 1996 in private practice Family Medicine at which time she transitioned her care to Addiction Medicine since 2014.

John Hosley, PA

Physician Assistant
John completed his undergraduate work at UC Davis and Master Degree of Physician Assistant Studies at University of the Pacific. A long time resident of the Sacramento area, John is committed to providing excellent, compassionate patient care in his community.

Carrie Starkey

Office Associate
Carrie brings several years of experience in human resources with a focus in staff development and learning management. She holds a Masters degree in Industrial and Organizational Psychology from Emporia State University.

Dr. LaFrenierre

Psychiatry Director

Dr. LaFrenierre received her medical degree at University of California, Los Angeles and completed her psychiatry residency at San Mateo Behavioral Health and Recovery Services. She also completed a fellowship through the Harvard Program on Refugee Trauma, and has expertise in the treatment of PTSD, veteran and refugee populations. She is board-certified in Adult psychiatry, and board-eligible in the specialty of Addiction Medicine. She has had a variety of specialty training experiences in addiction, geriatric and forensic psychiatry, and is committed to providing empathic and comprehensive care to her patients.

Jamie Guthrie RN, MSN, APRN-CNP

Jamie became a Registered Nurse in 2009, and achieved her Masters of Science as a Family Nurse Practitioner in 2017 at Graceland University. Her nursing experience includes 12 years of emergency medicine, and psychiatric care. Jamie is very passionate about empowering her patients to take an active, and well-educated role in their healthcare.