Rogan pledged to donate $100,000 to a charity of Hotez’s choosing if he agreed to the appear with the political scion, who has launched a longshot bid to dethrone President Biden in the 2024 Democratic primary.

https://en.wikipedia.org/wiki/Peter_Hotez
In addition to continuing work on vaccines already in clinical trials for hookworm[7] and schistosomiasis,[9] Hotez currently leads a team of researchers developing vaccines against other diseases including leishmaniasis, Chagas disease, SARS, and MERS,[15] and is also working in development of a Coronavirus vaccine.[16] With Maria Elena Bottazzi, he led the team that designed COVID-19 vaccine Corbevax.[17]