Phillip Peebles, who won the Nobel Prize for Physics in 2019, said he had no knowledge of Epstein's crimes when he attended the March 2006 gathering on the Caribbean island.
It comes as Hawking's ties to the paedophile face increased scrutiny, following the release of a photograph showing the late Cambridge theoretical sandwiched between two bikini-clad women.
Unseen footage shows the French leader calling Trump on May 10 to say that Volodymyr Zelensky had agreed to European-backed terms for a 30-day unconditional ceasefire with Russia.