Witten doesn't ring a bell with me. Googling the name might mean Edward Witten and Tarynn Madysyn Witten. Do you mean either or them or someone else?
I mean Edward Witten, one of the most prominent physicists alive. The fact that his name does not ring a bell is precisely my point. The names that do ring a bell are the names of folks who are "good at the media," not necessarily folks who are the best in their field.