New Delhi, June 9 -- For eighteen years, Lesley Groff organized Jeffrey Epstein's calendar, drafted his correspondence, and booked what she later described to the FBI as routine appointments. On Tuesday, she sat before the House Oversight Committee and answered for them. On Wednesday, the committee turns to Bill Gates.

staff first, then the network of elite figures whose names run through more than three million Justice Department documents released since January. Gates, the Microsoft co-founder and philanthropist whose scheduled appearance was confirmed by the committee and reported by CNBC and NPR, represents the most prominent entry in that second tier.

A spokesperson for Gates told reporters Tuesday that he "welcomes the opportunity...