Well, that answers it - Jeff is no more. Sad news indeed. I didn't know him as well as many of the members here but did have some excellent constructive discussions with him and feel like I really liked and respected him.
Look into it later when the dust is clearing off the crater.
Jeff was the reason I got into this hobby to start with...I bought several of his clocks, including one of the 'commemorative nixie clocks' as a kit back in 2002 or thereabouts....his untimely passing really gave me pause.
He was a very generous guy with his time and contributions to the nixie tube community at large...even though I only conversed with him via email over the last 12 years or so, I will miss him.