Dr. Rubén Oswaldo Greco Martínez, with a remarkable 45 years of experience, is a distinguished expert in the field of pediatric cardiac surgery, practicing at the Hospital Universitario Quironsalud in Madrid, Spain. Fluent in both Spanish and English, Dr. Greco Martínez has attended to a diverse range of patients, including those from foreign nations. His expertise lies in addressing congenital disorders, showcasing proficiency in advanced techniques such as the Norwood Technique, Ross Technique, Japan Operation, neonatal surgery, and ECMO-cardiovascular support. Educationally, Dr. Greco Martínez holds a University Degree in Medicine and Surgery from the Complutense University of Madrid, graduating in 1979. He further pursued his medical studies at the National University of La Plata in Buenos Aires, Argentina. His residency in General Surgery at the National University of Buenos Aires and in Cardiac Surgery at the University of Sao Paulo, Brazil, under the guidance of Professor Adib Jatene, added depth to his skill set. Notably, he completed additional training in London alongside Professor Donald Ross. Throughout his illustrious career, Dr. Greco Martínez has significantly contributed to the field of Cardiovascular Surgery. He has served at prestigious hospitals, including Gregorio Marañón and La Paz in Madrid. Since 2006, he has been dedicated to patient care at the Quirónsalud Madrid University Hospital. Dr. Greco Martínez is an active member of reputable organizations such as the Cardiothoracic Surgery Network (CTSNet), European Association of Cardiothoracic Surgery (EACTS), Extracorporeal Life Support Organization (ELSO), Society of Thoracic Surgeons (STS), and International Society Heart Lung Transplantation (ISHLT).