The author was one of the primary drivers of widespread mask adoption for Covid transmission suppression, by popularizing epidemiological and public health evidence.

See: https://masks4all.co/about-us/

I don't understand. Why would mask advocacy mean the CoC people have a vendetta against him? Is the conference run by Trump acolytes?

Wearing masks for covid prevention it seems like

> why it's so controversial?

I recommend watching Stephen Colbert's or Trevor Noah's talk show skits to gain an idea of why a pro-mask position is controversial in the states.