I was introduced to him pretty late in the game, in this interview where he and Joe Armstrong and Carl Hewitt talked concurrency! It was interesting hearing them discuss their different thoughts and approaches
How sad that we all missed when Carl Hewitt submitted that video to HN: https://news.ycombinator.com/item?id=19202209.
I had no idea that a discussion between the three of them even existed.
Also sad that now all three are gone.