The former longtime accountant for convicted sex trafficker Jeffrey Epstein appeared Wednesday for a closed-door deposition before the House Committee on Oversight and Government Reform as lawmakers seek a deeper understanding of the late financier’s wealth and network.

Richard Kahn worked closely with Epstein as his accountant for more than a decade and later became one of two executors of his estate following Epstein’s death in 2019. Investigators on Capitol Hill are seeking to understand how Epstein’s finances were structured and whether members of his inner circle helped sustain the financial infrastructure that supported his criminal activity.