COVID-19 vaccine, the co-founder of Moderna realized he wasn’t quite ready to hang up his hat.“I always said to people that I’ll be really happy on the day that we can impact human health,” said Rossi, speaking from the Boston area where he now lives. “I guess that day has finally come, and I’ve said I’ll hang up my hat, but I’m not ready yet.” Study finds Pfizer, Moderna vaccine immunity lasts longer.