From the AAI Distinguished Fellows website:
https://www.aai.org/Awards/Career-Awards/Distinguished-Fellows-of-AAI/Current-Recipients

"This program recognizes members for distinguished careers and outstanding scientific contributions as well as their service to AAI and the immunology community. It honors active, long-term members (25 or more years) who have demonstrated one or more of the following: excellence in research accomplishment in the field of immunology; exceptional leadership to the immunology community in academia, foundations, nonprofits, industry, or government at a national or international level; notable distinction as an educator.

Election as a Distinguished Fellow occurs annually and is among the highest honors bestowed by AAI. Distinguished Fellows bear the designation “DFAAI.”

Congratulations, John!