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.
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
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.
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 Idaho.
Tanika Barsegian, 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.
Samantha Byers, MPA
Director of Residential Services
Samantha became Director of Residential Services in 2017, after joining CODA in 2014 as Director of Quality Improvement. She previously spent 13 years working in the Child Welfare system, including case management and coordination of a $14 million federal grant for recovery services in the state of Oregon. She received the DHS Director’s Excellence Award for her work coordinating the Family Involvement Team (FIT) project, which brought together Child Welfare, juvenile court and treatment programs. Samantha earned a Bachelor of Arts in History from University of Portland and a Master’s in Public Administration from Villanova University.
Bonnie Holdahl, MBA
Director of Outpatient Services
Bonnie 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.
Eric joined CODA’s accounting department in 2014 before becoming the Director of Finance in 2015. He has provided accounting and financial management services in corporate and small-business settings, most recently including Daimler Truck of North America, Toyota Tsusho America and Erickson Aircrane, all in Greater Portland. He earned his undergraduate degree in History from the University of California, Irvine, and an MBA from George Fox University.
Jeannie Ragatz, MS, CADC-II
Program Director, Portland Recovery Center
Jeannie comes to CODA after 15 years in public and private sector healthcare serving members in multiple capacities. Prior to her work in healthcare, Jeannie provided community-based services to children and families involved with family court, and individual and group counseling for clients with substance use disorders. She also held positions with the Hawaii State Department of Health providing intensive in-home services to high-risk families, and the Department of Education providing school-based behavioral support to children with disabilities. Jeannie received her Bachelor’s and Master’s degrees in Psychology from
Chaminade University of Honolulu.
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.
Director of Development
Jill Murray joined CODA in 2015. She previously served as the Director of Foundation and Corporate Relations at Concordia University. Jill worked for 14 years advocating for people with intellectual and developmental disabilities, through the OHSU Center on Self-Determination, Portland State University’s Regional Research Institute for Human Services, The Oregon Council on Developmental Disabilities, Oregon Technical Assistance Corporation, and The Arc of Oregon.
Mark 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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