The bio of Joseph Mifsud, the professor at the center of the Trump-Russia probe, has been removed from the website of the university in Rome where he has worked for years, BuzzFeed reports.

In late October Mifsud was identified by the Washington Post as one of George Papadopoulos’ key links to Russian officials. Papadopolous, President Donald Trump’s former foreign policy adviser during the presidential campaign, pleaded guilty Oct. 5 to lying to federal agents about his contacts with people with connections to the Russian government.

Mifsud worked as a professor at Link Campus University (LCU) in Rome, where he led a three-year degree course in political science and international relations. An FBI affidavit unsealed in late October stated Papadopoulos acknowledged the professor “had told him about the Russians possessing dirt on then-candidate Hillary Clinton in the form of thousands of emails.”

But his name no longer appears on the faculty pages, and his bio now goes to a 404 error page. Mifsud, according to a fellow professor who spoke to BuzzFeed anonymously, hasn’t been seen on the Rome campus in weeks.