John Daffy is an infectious disease physician.  He has been working in this are for over 2 decades. Being from a rural back ground he has very pragmatic approach to medicine. 
More interesting is the back story about how he took time off from medical school to focus on running and his interest in horse training. 
In recent months he has been on other podcasts including "You cannot be serious" . In this podcast he discusses the importance of getting the vaccine to an audience who may be more reluctant to get the vaccine.