The US Food and Drug Administration has named Vinay Prasad, an oncologist who has previously criticized COVID-19 restrictions, as the director of its Center for Biologics Evaluation and Research, an internal email seen by Reuters said on Tuesday.

The US FDA’s commissioner, Marty Makary, made the announcement in an email to staff.

Prasad comes to the FDA from the University of California at San Francisco.

In March, Peter Marks, the FDA’s former head of the division, which regulates vaccines and biologics, was pushed out of the agency.

Scott Steele, an FDA insider for the past five years, had been serving as acting head of the division after Marks’ exit.