Moncef Slaoui , who served as chief scientist for former President Donald Trump s COVID-19 vaccine development program Operation Warp Speed , has been fired as chairman of a pharmaceutical board over substantiated sexual harassment allegations against him, the company said Wednesday.

The allegations against Slaoui, who lost his position as chair of the board of directors for Galvani Bioelectronics, first came to light through a letter the company received in February, according to the companys majority shareholder, GlaxoSmithKline (GSK).

A law firms investigation into Slaouis conduct ultimately substantiated the allegations, which involved a GSK employee and took place several years ago, according to GSK, which is based in the U.K.

No other details of the allegations were available, but GSK described them in a statement as wholly unacceptable, adding: They represent an abuse of his leadership position, violate company policies, and are contrary to the strong values that define GSKs culture.