Dr. Vinay Prasad, the controversial critic of the US Food and Drug Administration who took a top role at the regulatory agency in May, has resigned less than three months into the job.

Vinay Prasad, a top official at the Food and Drug Administration, has suddenly departed after a series of controversial decisions about a treatment for boys with Duchenne muscular dystrophy.

Prasad's exit ends a tumultuous tenure during which he led a reworking of agency guidelines on COVID vaccines and his office got embroiled in controversy over a Duchenne gene therapy.