Assuming you're genuinely curious, some of Jon Skeet's achievements for which he has not received any SO karma include:

Noda Time - https://github.com/nodatime/nodatime/graphs/contributors The C# Protobuf port - https://github.com/jskeet/protobuf-csharp-port/graphs/contri...

Noda time is one of the top 100 downloaded packages on nuget.

That's quite a significant contribution to the .NET open source ecosystem - especially for someone whose day job is programming Java at Google, so these are pure side projects (.

He also wrote C# In Depth which is one of the standards by which programming language books should be judged (up with books like K&R, JavaScript: The Good Parts, and Essential Java).