Senior Staff

    Shannon O. Large, DNP, APRN, ANP-BC, CARN-AP
    (Ext. 135 • email: 

    Dr. Shannon O. Large, DNP, APRN, ANP-BC, CARN-AP, Chief Executive Officer of Intervention Project for Nurses, has expertise in the areas of alcohol and substance use related conditions, forensic drug testing, primary care, and the assessment and treatment of impaired professionals. In her role as CEO, Dr. Large assures that IPN services are consistent with the goal of protecting the healthcare consumer from nurses with impairing conditions, while simultaneously providing assistance to the nurse. The CEO serves as the consultant to the Department of Health, coordinating ongoing program needs assessment based on State requirements and national best practices.

    Dr. Large received her Doctor of Nursing Practice degree in 2013 from University of Florida and is an American Nurses Credential Center, Board Certified Adult Nurse Practitioner, and is also a Certified Addictions Registered Nurse in Advanced Practice. Additionally, Dr. Large is a member of the International Nurses Society on Addictions and served as a Director at Large on the Board of Directors from 2018 to 2020. She is a member of the Florida Nurses Association (FNA), American Nurses Association (ANA), Florida Nurse Practitioner Network (FNPN), Sigma Theta Tau International Honor Society of Nursing, Lambda Rho Chapter, and is active in the Florida Quality and Unity in Nursing (QUIN) organization.


    Myrtle Greene, LMHC, CAP, ICADC
    (Ext. 147 • email:

    Myrtle Greene, serves as the Chief Operating Officer (COO) at the Florida Intervention Project for Nurses (IPN). She is a Licensed Mental Health Counselor (LMHC), Certified Addiction Professional (CAP) as well as an International Certified Addiction Counselor (ICADC).

    Myrtle regularly provides workshops and trainings on “Workplace Impairment” to healthcare and nursing organizations and has authored professional publications on addiction in healthcare settings.
    She has a Master of Arts in Counseling Psychology, a Master in Rehabilitation Counseling and currently is pursuing her doctoral degree in Psychology. Her current research focuses on effectiveness of training tools to improve competency when addressing impairment in the workplace. Myrtle currently serves on the Board of Directors for the National Organization of Alternative Programs (NOAP). She is a member of the Florida Quality and Unity in Nursing Council (QUIN), American Psychological Association (APA), National Alliance on Mental Illness (NAMI) and the Florida Mental Health Association (FMHA)

    John C. Tanner, D.O. DipABAM, FASAM, CCFC, MRO
    (ext. 149)

    Dr. John C. Tanner,is one of the inaugural physicians certified by both the American Society of Addiction Medicine (1986) and the American Board of Addiction Medicine (2009), in addition to being a Clinically Certified Forensic Counselor. Dr. Tanner has worked in the addictions field since 1984 and previously served as Assistant Medical Director of the Florida PRN program. He serves on the Board of ASAM and remains actively involved in treating impaired professionals. IPN is very pleased to have Dr. Tanner on staff for his expert consultation, review of complex cases and best practices education.

The mission of IPN is to ensure public health and safety by providing education, monitoring, and support to nurses in the State of Florida