The authors dedicate this work to Dr. Corey Slovis, long-time mentor, teacher, and friend. For Emergency Medicine, he is iconic and his impact immeasurable. Dr. Slovis has led and taught thousands of emergency care providers and is one of the greatest educators we know. Through his teachings we have learned how high-quality education is essential for medical knowledge and clinical expertise. His “5 Causes, 5 Steps, 5 Reasons” for almost everything in medicine has resonated worldwide. As “El Jefe” retires, we offer our gratitude and deep appreciation for his service to our specialty and to Edition 5 of The Atlas of Emergency Medicine. Our patients have been and will be the ultimate beneficiaries of his magnificent career.