Dr. Mary Ellen Biggerstaff is a family nurse practitioner, educator, and advocate with over 15 years of clinical experience in primary care, addiction medicine, and harm reduction. She has served on national and state boards for nurse practitioners and has developed continuing medical education programs focused on substance use disorders. Dr. Biggerstaff is an experienced speaker and published author, with expertise in policy and practice innovations for improving care for vulnerable populations, including individuals affected by opioid use disorder.