Nov. 19 (UPI) -- Former U.S. Treasury Secretary Larry Summers will resign from the OpenAI board of directors following intensified scrutiny over emails between him and sex offender Jeffrey Epstein, he announced Wednesday.

"I am grateful for the opportunity to have served, excited about the potential of the company, and look forward to following their progress," Summers told CNBC and CNN in a statement.

Summers, 70, revealed Monday that he will "step back" from all public duties, but it was initially unclear if that was to include his role with the artificial intelligence startup.

This week, Summers said he was "deeply ashamed" after emails released last week revealed years of correspondence with the late billionaire financier and convicted sexual predator Epstein.

The AI company said it respected his decision.