I had to look up "intensivist". To save others the trouble: "An intensivist, also known as a critical care physician, is a medical doctor with special training

I had to look up "intensivist". To save others the trouble: "An intensivist, also known as a critical care physician, is a medical doctor with special training and experience in treating critically ill patients. An intensivist completes a fellowship in critical care medicine after finishing a residency in internal medicine, pulmonary medicine, anesthesia or surgery."