No, I'm not on Facebook. I think I found him on Spokeo, back in 2010, sent a message via that site (which maybe I had to pay for?), and then he replied back via email, which was surprising actually, as using the Spokeo site was a bit of a gamble on my part. I wasn't expecting it to get through to him. I don't think I should pass it on though, as I doubt that he would want his personal email address to get "out there". If you really want to get in contact, I can send him your details with a message.
If you haven't seen it yet, Jeff Stephenson was interviewed in a very interesting podcast back in 2021. It's about 2 hours long and I listened through the whole thing:
https://www.iheart.com/podcast/263-video-game-newsroom-time-m-45878361/episode/jeff-stephenson-interview-90467135/#He has some very interesting things to say from the early years, including in relation to the IBM projects. He mentions being "in the room" with the KQ project team, so although he wasn't working on that project, he remembers "
the chortles of excitement when they finally got an animated figure, and it went behind a bush, except that the bush had holes in it and you could see him through the holes" (that's a quote from the podcast).
He also has a different version of the "back of a napkin" story regarding the meeting with IBM. I read an article online (the Jimmy Maher one?) that mentioned that KQ was designed on the back of a napkin, but in the podcast, Jeff says that it was actually HomeWord that was designed on the back of a napkin, and that the 3D animated KQ idea had already been designed by Ken and Roberta. So when Ken and Jeff flew to Florida for the pitch to IBM, it was to pitch the idea of the 3D animated adventure game. Jeff mentions it was at drinks afterwards that they came up with the HomeWord idea on the napkin, and then took that idea back to IBM. Listen to the podcast to get his exact words. I'm paraphrasing a bit from memory.