Both prehospital emergency care and ancestral emergency rooms predate the emergency medicine specialty itself. Out of the many wars and civilian side catastrophes came the realization that competent care was needed before and during transport to a hospital. At the same time, early emergency rooms, often small and inconveniently located in basements or on second floors, served as the natural intersection for walk-ins, ambulances and hospital wards in the early and mid-twentieth century.

The technological boom following the Second World War was in part responsible for the transition from outpatient to hospital-based medicine. More could be done and in a quicker time frame inside of a hospital, and the sickest of the sick now perhaps had a chance of survival. A natural demand for expanded and better-equipped casualty (aka accident- or emergency-) departments was created. At the same time, more patients presenting to EDs with non-traumatic complaints underscored the need to move beyond mere trauma and injury.

Still, as the earlier version of this chapter correctly stated, “Only a few decades ago, emergency departments…were staffed by physicians with a variety of training backgrounds. The vast majority of these physicians had little to no emergency medicine training at all. General surgeons, family physicians, neurologists, and even psychiatrists were among those that staffed emergency departments…throughout the world” [1].

In the 1960s and 1970s things began to change rapidly. As ambulance care and destination decisions improved, in some nations relying on physicians and in others on newly established paramedics, so did the understanding that a dedicated provider specializing in ED services was invaluable. In the United States, pioneer physicians who chose to work exclusively at EDs provided additional advantages to the lifestyles and efficiency of specialists. Freeing up the latter to concentrate on more complex specialty-driven tasks led to their higher reimbursements. Thus, both the absence of competing emergency care physicians in the prehospital domain and economic incentives created by EM for narrow specialties pushed EM development in the US somewhat ahead of other parts of the world. The vast and ubiquitous benefits of EM to the general public were to follow.

From the 1970s and on rapid growth of EM residencies took place, together with the founding and strengthening of EM national boards and EM national and international societies. Brian Zink’s famous “Anyone, Anything, Anytime” comprehensively describes the history of modern EM in the United States [2]. Another excellent resource is this documentary from the Emergency Medicine Residents’ Association (EMRA). Such a trajectory was closely matched by EM’s path in the United Kingdom, Canada, Australia and other culturally Western nations, steadily but surely spreading throughout most of the world.

With every decade that followed, the number of countries developing EM increased exponentially. Arguably, each nation’s own EM chronicles are best regarded and studied in tandem with texts like Ryan Corbett Bell’s “The Ambulance”, which ought to describe the contemporaneous evolution of not only prehospital medicine but of the overall emergency care landscape in each nation as the precise background for EM’s necessity, birth and its coming of age [3].