Daniel Schultz, who led FDA’s medical device division for five years, said Tuesday he will step down from his position. The move comes after nine scientists wrote to the Obama administration transition team earlier this year, saying that they had been pressured to approve certain devices.

While FDA scientists had rejected a knee repair device made by Regen Biologics several times because of increased risks to patients and a lack of benefit, Schultz approved the device in late 2008.