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In page Certified anesthesiologist assistant:

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In the 1960s, three anesthesiologists, Joachim S. Gravenstein, John E. Steinhaus, and Perry P. Volpitto, were concerned with the shortage of anesthesiologists in the country. These academic department chairs analyzed the spectrum of tasks required during anesthesia care. The tasks were individually evaluated based on the level of professional responsibility, required education and necessary technical skill. The result of this anesthesia workforce analysis was to introduce the concept of team care and to define a new type of anesthesia provider called a mid-level anesthesia practitioner linked to a supervising anesthesiologist. This new professional - the Anesthesiologist Assistant or AA - was an answer to help alleviate this shortage[citation needed]