Established in April of 2004, Castlerock Medical Group is a private medical group that incorporates excellence in the prevention of cardiovascular and metabolic disease, diagnostic and adult medical care, and clinical research. This combination of entities allows adult patients to experience a comprehensive approach to their personal medical needs. Castlerock Medical Group was created by Richard N. Marple, MD, FACP, CCRI and Susan B. Marple, MSN, NP, CCRC.