Melissa Olen, MSN, APRN, FNP-C, CCRN, is a highly experienced Family Nurse Practitioner specializing in pediatric and adult congenital cardiology and cardiac electrophysiology at Nicklaus Children’s Hospital, Miami, where she provides comprehensive care across pre-, intra-, and post-procedural settings, independently evaluates patients with chest pain, murmurs, syncope, palpitations, and abnormal ECGs, and manages complex rhythm disorders through advanced interpretation of echocardiography, electrocardiograms, stress testing, Holter and event monitoring, and interrogation of pacemakers and ICDs. Her clinical expertise includes collaborative inpatient management, anticoagulation and INR coordination, and procedural participation in electrophysiology studies, vascular access, device programming, and peri-procedural consent, ensuring patient safety and education. She has particular expertise in inherited channelopathies, providing genetic counseling, coordinating testing, and translating results for families, as well as in the longitudinal care of single-ventricle and Fontan patients through standardized surveillance programs that address long-term complications and optimize lifelong outcomes. Actively engaged as a clinical leader and research advocate, she contributes to quality improvement, interdisciplinary collaboration, and family-centered education in advanced cardiac care. Her scholarly impact is reflected in an h-index of 10, with 18 published documents that have received approximately 350 citations across more than 337 citing works, highlighting the influence of her clinical and research contributions to cardiovascular nursing and electrophysiology practice.