The WPSI consultants are carefully selected physicians who are willing to serve as champions across the state of California to improve and enhance the treatment of patients struggling with opioid use disorder (OUD) using medications for addiction treatment (MAT). Each have ample experience prescribing buprenorphine and other medications and can be accessed to mentor other X-waivered prescribers seeking additional consultation.


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Angella Barr, MD

Dr. Angella Barr is the medical director of Chemical Dependency and Treatment Associates Inc. (CDTAinc) located in Sacramento, CA. She is a fellow-trained and board-certified addiction medicine specialist, with a unique skill for buprenorphine (Suboxone) treatment for addiction and pain. Her other specialties include general medication management and treating chemical dependencies during pregnancy.

Dr. Barr's education and training took her from one coast to the other and back again. She received her biochemistry degree from the University of Nevada, Reno and her M.D. from Columbia University of Physicians and Surgeons, New York, N.Y. She interned in New Jersey and did her residency at Kaiser Permanente in San Francisco before receiving her fellowship training at the San Francisco Veterans Affairs Medical Center and the University of California, San Francisco.

Dr. Barr also received specialized training in psychotherapy, allowing her to use psychotherapeutic concepts to get to the root cause of addiction and develop a more effective treatment plan.

Dr. Barr is an active member of the California Society of Addiction Medicine (CSAM). She works on several committees within the Society, including, Education, Public Policy, Integration & Access to Systems of Care, and Conference Planning. She has testified to the California legislature on critical bills about addiction in her work in the CSAM public policy. She has served in several leadership roles, helping to educate fellows, residents and other physicians. She also served on the committee to develop policies around opiate dependency and pregnancy, as well as representing the addiction specialty within interdisciplinary workgroups with pain and psychiatry.

Dr. Barr is passionate about chemical dependency treatment. She strongly believes in fostering effective treatment by combining known neurobiological medication modalities with simultaneous work in the behavioral and psychosocial aspects of the whole person.

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Cheryl Ho, MD

Dr. Ho is one of the physician co-founders of the Valley Homeless Healthcare Program (VHHP) in San Jose, an organization that is part of Santa Clara County's Health and Hospital System. Board certified in both Internal Medicine and Addiction Medicine, Dr. Ho provides primary care in a FQHC context for individuals experiencing homelessness in Santa Clara County. In 2010, she started the organization's first medication-assisted treatment (MAT) clinic at VHHP in 2010 for homeless individuals with an opiate use disorder. This clinic quickly became one of the highest volume primary care clinics that provide buprenorphine in the state of California for the Medi-Cal population. Her team is well known for its health care innovations, including the use of a multi-disciplinary shared medical appointment that combines medical treatment (MAT), behavioral health treatment, and social work assistance in a group visit with 10-15 other patients.

Dr. Ho also serves as a technical assistance consultant with the Janus of Santa Cruz through the California Hub and Spoke Initiative. She is also part of a research group that is starting a national multi-center clinical focused on combining a Housing First model with a clinical shared medical appointment model for MAT in homeless individuals with opiate use disorder.

Kawika Liu, MD, PHD, JD

Kawika Liu, MD, PHD, JD

Kawika Liu, MD, PhD, JD is an internist/pediatrician/addiction medicine specialist, currently chief medical officer at Tuolumne Me Wuk Indian Health Center. Previously, he has been a medical director and provider at a rural health center, tribal health center, and FHQCs. Kawika received his MD from St George's University School of Medicine, his PhD and JD from University of Hawai'i, Manoa. Dr Liu has published in lung cancer and other health inequities in Native Hawaiians. His interests are population health, human rights-based approaches to health, particularly indigenous health, causation in public health, cancer, obesity, and asthma. He is the father of two daughters.

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Lisa Netherland, MD

Lisa Netherland, MD, has provided Medication Assisted Treatment in both specialty addiction clinics and integrated primary care settings utilizing quick start/low threshold buprenorphine prescribing and continuity MAT care. She is Board Certified in Addiction Medicine and Family Medicine. She is an MAT Coach through the California Healthcare Foundation; an academic detailer for the Hub & Spoke Initiative; a MERF-MATE, providing MAT mentorship for clinicians and residents; and a consultant on SAMHSA grants to expand MAT services in FQHCs. Her primary practice is in the San Francisco/East Bay area where she focuses on treatment of addiction and its medical sequelae in underserved communities.

Candy Stockton-Joreteg, MD

Candy Stockton-Joreteg, MD

Dr. Stockton is Board Certified in both Family Medicine and Addiction Medicine.

She has worked in FQHCs/RHCs for the past 12 years, and sees every day how the disease of addiction affects her patients and their families. This has led to a passion for working with pregnant and parenting women with addictions and for addressing the upstream causes of addiction in our communities.

Dr. Stockton is active in community outreach, serving with various groups that address addiction and family issues. She has worked with law enforcement to increase access to Narcan in our communities, and is an active speaker working to help educate community members about addiction and treatment for addiction. She also works with residents and NP/PA fellows to help future medical providers become more comfortable treating addiction.

Her volunteer projects include coordinating medical relief trips to Haiti and Guatemala, school and church construction projects in Panama and Guyana, and teaching hands-on science and art lessons to 3rd-8th graders at a local school.

Rebecca Trotzky, MD

Rebecca Trotzky, MD

Rebecca Trotzky is a family doctor & addiction medicine subspecialist, in the Emergency Department of LAC + USC. She is dually appointed faculty in both emergency and family medicine departments. She is the Medical Director of Urgent Care and Continuity Care Center, and Jail Health Services. She opens the doors to Los Angeles County Department of Health Services for all regardless of immigration or insurance status.

She also serves as chair of the LAC USC Pain Recovery and Opioid Use Disorder committee. In this role she advocated for reduction in opioid prescribing, resulted in decrease of 40% in 2 years. She has developed county-wide program to treat opioid withdrawal and opioid use disorder with science based treatment of buprenorphine. She believes that buprenorphine and naloxone saves lives, and should be available in all settings.

During medical school at U of MN, Rebecca was a Fulbright Scholar in Venezuela studying health care system transformations. After residency at Harbor UCLA and Kaiser Permanente, Rebecca was staff at Program for Torture Victims treating asylum seekers. Before all that Rebecca was a young single mom on food stamps, and a high school drop out from Minneapolis.

Aimee Moulin, MD

Aimee Moulin, MD

Dr. Aimee Moulin is an Emergency Physician and ED Behavioral Health Director at UC Davis, recent past president of Cal ACEP, and Co-Director of Emergency Department Services for the California Bridge Program.

Dennis A. Wichern

Dennis A. Wichern

Dennis Wichern is a partner in Prescription Drug Consulting LLC, focusing on medical prescriber protection, compliance, and risk mitigation. His experience includes 30 years of public service as a DEA Special Agent retiring in 2018 as the Special Agent in Charge of the Chicago Field Division where he directed all federal operations in the states of Illinois, Indiana, Wisconsin, Minnesota and North Dakota with a team of approximately 550 employees.

Dennis is a recognized expert on the dangers of heroin and the prescription drug opioid epidemic and routinely speaks to healthcare providers to identify methods to better safeguard their practices and reduce the professional and operational risks emanating from these threats. Dennis was the first to develop basic and advanced CME prescription drug classes focusing on prescriber safeguards, DEA compliance, MAT, pain and drug destruction.

Dennis has been a guest lecturer on medical prescriber safeguards to medical students, residents and prescribers at Harvard Medical School, Boston, MA; Northwestern University Feinberg School of Medicine, Chicago, IL; Illinois State Medical Society, Chicago, IL; Illinois Surgical Quality Improvement Collaborative, Chicago, IL; Southern Illinois University School of Medicine, Springfield, IL; Indiana University School of Medicine, Indianapolis, IN; and several additional schools and hospital groups. Dennis has also lectured with the American Bar Association Health Law Section; the American Health Lawyers Association; Indiana University McKinney Law School, and at the DEA Training Center in Quantico, VA.