The director of MIT Media Lab has resigned after documents and emails showed that he attempted to hide close financial ties between his research center and Jeffrey Epstein, a convicted sex offender who died by suicide last month.

Joichi Ito resigned from his post at the prestigious educational center on Saturday after emails and documents obtained by the New Yorker detailed how faculty and staff at the Massachusetts Institute of Technology attempted to hide Epstein’s ties with the university’s research. Ito had previously acknowledged that the university had accepted over $500,000 from Epstein directly, but the uncovered communications revealed that Epstein raised millions more for the research center from philanthropist Bill Gates and the investor Leon Black, according to the New York Times.