What incredibly sad news !Having done some quick research I think that I first met Stefan during an A.net meeting that I had organised at ZRH in 2010 which included a guided tour of SR Technics.
A few other NAS meetings followed in subsequent years with an interruption before and after my father´s death.
I always thought that Stefan originated from Hamburg, but it was during a meeting at FRA that we found out that he grew up the city of Espelkamp in Eastern Westphalia, a mere 60 klicks west of my home town.
And having been to Espelkamp myself I fully can understand that Stefan moved away from there looking for Big City Life, and The World.
(Espelkamp´s number of inhabitants "exploded" (no pun intended) to more than ten-fold after the Second World War, when a former grenade manufacturing site was converted into a refugee camp, gradually turning into permanent housing over the next decades. One big chunk of new arrivals were people of German descent relocating from the Soviet Union (especially from Kazakhstan SSR) in the 1970´s.)
The world has lost quite a character with Stefan !
My sincerest condolences !
P.S.
If anybody would bring up the idea to hold a "Farewell to Stefan Meeting" at some place in Europe this summer I should be among the first to subscribe to it.
-HT
Use your time wisely; remember that today is the first day of the rest of your life.