The first line of his testimony mentions working at the American Institute for Behavioral Research and Technology. Knowing how congressional testimonies tend to work, I Googled that to see if was one of those politically motivated think tanks with an intentionally neutral sounding name. Robert Epstein's Wikipedia page was one of the top results. I clicked through and noticed that roughly half of the content of that page was under the header "Criticism of Google". The links I included all came from either the Wikipedia sources, Epstein's testimony, or a link from one of those. The whole thing took maybe 5 minutes and didn't require any research skills beyond simply being curious.