Former FDA Commissioner Mark McClellan, now living in the Triangle, talked to ABC11 about his former agency's work to approve an Omicron vaccine Former FDA Commissioner Mark McClellan, now living in the Triangle, talked to ABC11 about his former agency's work to approve an Omicron vaccine Former FDA Commissioner Mark McClellan, now living in the Triangle, talked to ABC11 about his former agency's work to approve an Omicron vaccine