Sad news indeed.
I rode a around Wendover and the Surrey Hills with him a couple of times back around 1985, before US 'Mountainbikes' had really arrived. I was just getting into off-road riding, and the 'cross-country bicycle' really aligned with how I wanted to travel. Quiet, uncompetitive, no racing...touring, bimbling around your real space and head space.
After a couple of more recent annual Wendover Bash anniversary rides, in 2019, I was commissioned by Geoff to make a prototype production version of his current Landseer bike.
Like so many single-minded and obsessive detail guys, he could be hard to collaborate with. We had many discussions on supply chains, pricing, practicality and current fashion, along with the needs of actually producing and selling several bikes compared with designing just one example of the best possible solution...While ultimately fruitless, the discussion was always good natured and constructive.
Here it is without its mudguards and and mud deflectors for the chain/belt:
He ploughed his own muddy furrow for a lifetime with so little acknowledgement or return, except from a handful of devoted followers and advocates.
Despite lifelong mental health and identity issues, he always looked to the future and how it might be improved in so many ways.
All the best,