CODA’s Leadership team

To reach members of our staff, please call our main number, 503-239-8400 or email using the form on our Contact Us page.


Tim Hartnett bioTim Hartnett, MSW, MHA
Executive Director

For more than 35 years, Tim has worked with vulnerable and under-served populations, from incarcerated juveniles to homeless persons suffering from severe and persistent mental illness and substance use disorders. He has worked as a school teacher, direct-service worker, program director, research partner and state policymaker. He has served as an adjunct faculty member at Portland State University’s School of Social Work and is a Visiting Research Fellow in the Queen’s University School of Social Sciences, Education and Social Work in Belfast, Northern Ireland. Tim joined CODA in 2002 and has served as a member of the Oregon Alcohol and Drug Policy Commission, as president of the Oregon Prevention Education and Recovery Association (OPERA), and as a member of the executive and steering committees of the National Institute on Drug Abuse Clinical Trials Network. Prior to joining CODA, Tim was director of the Division of Alcohol and Drug Abuse Prevention and Recovery for the State of New Hampshire Department of Health and Human Services. He received his Master of Social Work from University of Connecticut and his Master of Health Administration from Suffolk University in Boston.


Eve Klein, MD
Medical Director

Eve has provided clinical services at CODA since 2015, becoming Medical Director in 2016. She also serves as an Instructor in the Comprehensive Adult Neurology Clinic at Oregon Health & Science University where she teaches medical students and treats patients with chronic pain and other neurological disorders. In addition to her neurology residency, Eve completed pain medicine and addiction medicine fellowships at OHSU. She practiced pain management in the Portland and Vancouver area for four years before joining the field of substance use disorders treatment. She received her undergraduate degree from Columbia University in the City of New York and her medical degree from the University of Massachusetts Medical School.


Alison Noice bioAlison Noice, MA, CADC-III
Deputy Director

Prior to becoming Deputy Director, Alison directed CODA’s Addiction Medicine Program. She has worked exclusively with under-served and indigent populations since moving to Multnomah County in 1999. Prior to joining us in 2010, Alison managed a psychiatric urgent-care clinic, where she worked with high-risk patients and supervised a multidisciplinary team of mental health and medical professionals. She studied Clinical Psychology at University of Montana and received her Master of Counseling from Pacific University. In 2016, Alison received her Graduate Certificate in Healthcare Management from OHSU. Her undergraduate degree is from University of Idah


Cassie Archer, MS
Director of Community Relations

Cassie joined CODA in 2017 as Director of Community Relations. She previously worked for CareOregon as a Behavioral Health Innovation Specialist focusing on integrating behavioral health into primary care and for FamilyCare as Manager of Behavioral Health following Oregon’s Medicaid expansion. Before serving in healthcare management, Cassie’s work focused on community health, housing and child welfare.  She received her Master’s degree in Clinical Psychology from University of Memphis and her undergraduate degree from University of Georgia.


Tanika Barsegian, MBA, SPHR
Director of Human Resources

Tanika joined CODA in 2017. She leads a team of Human Resources professionals in the areas of recruitment, employee and labor relations, benefits, training and development. Tanika received her Master’s in Business Administration from Portland State University and she holds the Senior Professional in Human Resources (SPHR) credential. She is a longstanding member of the Society for Human Resource Management.



Bonnie Holdahl, MBA
Director of Outpatient Services

Bonnie Holdhal bioBonnie joined CODA in 2014 as the Program Director for Outpatient Services. She previously served as Director of Psychiatric Services at LifeWorks NW, and also held management positions in mental health and women’s and reproductive health in the Portland area for more than eight years. Prior to her work in management, Bonnie was a patient advocate and clinic assistant at Planned Parenthood Columbia Willamette. She earned her MBA with a focus on healthcare management from Oregon Health and Science University. Her undergraduate degree is in History.


Joseph Martin
Director of Finance

Joe joined CODA in 2017 as leader of the Finance and Accounting team. Prior to joining the agency, he was most recently the Director of Financial Planning & Analysis at ESI, Inc. (Electro Scientific Industries) in Portland. In his previous roles, Joe served corporations in the fields of healthcare, law, semi-conductors, electronics research and development, software development and aquaculture as a Chief Financial Officer and Certified Public Accountant. A veteran of the US Navy, Joe received his BSBA in Accounting & Finance from the University of Arkansas at Fayetteville.


Katharina Wiest bioKatharina Wiest, Ph.D., MSPH
Director of Research

Katharina joined CODA in 2007. As Director of Research, she participates as site principal investigator in clinical trials through the Clinical Trials Network of the National Institute on Drug Abuse as well as other academic institutions and organizations. She also provides ongoing, real-time assessment and evaluation of CODA’s population through analyses of the electronic medical records. Katharina received her doctorate in epidemiology from the University of Washington, her Master of Science in Public Health in epidemiology from the University of California-Los Angeles, and her bachelor’s degree in Biology from Pitzer College. She is currently an Affiliate Assistant Professor in the Department of Public Health and Preventive Medicine at Oregon Health & Science University.





Mark McGovernMark McGovern, Ph.D. Mark McGovern consults and advises CODA clinical leadership on the implementation of scientific evidence-based approaches to the assessment and treatment of substance use and mental health problems. Mark is a Professor of Psychiatry & Behavioral Sciences at Stanford University School of Medicine. His research program is based in the Division of Public Mental Health and Population Sciences, and he practices clinically at the Stanford Department of Psychiatry Clinic. His primary research focus is implementation science, with a specific emphasis on integrated behavioral health services for persons with co-occurring substance use and psychiatric disorders, as they present in both primary care and specialty settings.




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