Former Treasury Secretary Larry Summers retreated from his most prominent public roles Wednesday as he severed ties with OpenAI, the maker of ChatGPT, and other organizations over recently released emails showing he maintained a friendly relationship with Jeffrey Epstein.

Meanwhile, Harvard University reopened an investigation into connections between the former Harvard president and Epstein, and Summers appeared before an economics class that he teaches there.

Regarded as a leading voice on the U.S. economy, Summers was also affiliated with multiple think tanks, research centers and media organizations, including The New York Times. Several of them confirmed that those affiliations have ended.

Harvard did not mention Summers by name, but the decision to restart the probe comes after th

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