I will miss his writings, and that website was a legend. A great, gentle, and inspired man, clearly gave his life to teaching others, humbly, and with passion and dignity.
My longest-lasting amp is one I built inspired by Leach's Low TIM Amp. I put it together from bits and pieces in 1979, and it's still around today, ugly but functional. It's not often that you get a great engineer and educator in the same package - a sad passing.