Russell Ackoff, the great systems thinker, passed away earlier this week.
I've just finished reading Ackoff's Beating the System, a gentle, humours, thoughtful little book. I wish I'd met him in person.
[via Wikipedia, I've just found 4 high quality, low resolution, videos of a lecture Russell Ackoff gave in 1990. The 4 videos run for a few hours.]