When StackOverflow was just getting started I was doing Java professionally. Jon Skeet contributed a ton of very helpful Java answers back then which helped me

When StackOverflow was just getting started I was doing Java professionally. Jon Skeet contributed a ton of very helpful Java answers back then which helped me a lot. I only later learned hat he has written a book about C# and that he really was a C# expert - still he knew more about Java than most Java experts. Add to that that he is really good at writing detailed and to the point answers and you know where his reputation comes from. I only met him once briefly at CodeKen in London but judging from that he is a nice guy too.