Ryan Cook

Ryan Cook is a Senior Professor at Oregon Health & Science University. His research addresses public health, addiction medicine, and health policy, with a focus on rural substance use, opioid use disorder, and harm reduction. His recent work centers on peer-delivered contingency management for stimulant use, injection practices among rural people who inject drugs, and clinical trial engagement preferences. He also investigates pharmacological safety, including adverse outcomes from benzodiazepine and Z-drug prescriptions among Medicaid beneficiaries. His 2025 publications span venues such as *Addiction*, the *International Journal of Drug Policy*, and the *Harm Reduction Journal*, reflecting his leadership in community-partnered research and implementation science.