“He is a n unquestioned expert in his field and anyone who holds that post at Yale is considered to be at the top of their field.”
He is definitely quesitioned. See for example Matthew P Fox, Lucy D’Agostino McGowan, Bryan D James, Justin Lessler, Shruti H Mehta, Eleanor J Murray, Concerns About the Special Article on Hydroxychloroquine and Azithromycin in High Risk Outpatients with COVID-19 by Dr. Harvey Risch, American Journal of Epidemiology, , kwaa189, https://doi.org/10.1093/aje/kwaa189. Dr. Risch’s claims have been debunked.