Eccentric doesn't do justice to the guy. Jimi Hendrix's Purple Haze is a reference to his acid. Owsley's acid was mostly called - erm - Owsley's acid and figures in the rabbit's first (unpublished) novel White Rabbit - sorry had to slip that one in! He started manufacturing LSD when it was legal but carried on after it became illegal. In the end he was inevitably busted and ran the highly amusing (or at least the rabbit is amused) defence that 350,000 tabs of acid were for - erm - personal use. Result: 3 years inside.
Stanley's eccentricities did not end there - he believed that carbohydrates poisoned the body and vegetables interfered with nutrition. In 2005 he contracted throat cancer, attributing his survival to starving the tumour of glucose through diet. Well - erm - apparently it worked. As a sound engineer, the fact that the Dead's archive is hugely with us is down to his diligence but as an obsessive, his sound systems were often less than practical and took forever to put up and take down.
His final eccentric project was - believing that global warming was part of a natural cycle and not man made and anticipating a new ice age as presumably the next stage in the cycle - moving to the Australian outback as the safest place to be in for that sort of event. He had four children including a son called Starfinder and a daughter called Redbird. Let Garcia have the final word: 'there's nothing wrong with Bear that a few billion less brain cells wouldn't cure'.
Oh and he also created this...