For the past couple of years I have been the lead designer of C#. Anders and I took a break to help create TypeScript, and then he stayed on as it's lead designer, while I returned to take over C#.

Anders and I meet every week to compare notes, and I make sure to get his input on major new features in C#.

Apparently he is mostly focused on Typescript nowadays, and not so much on C#, although he still participates on its development.

At least given his latest interviews on Channel 9 and BUILD sessions.

He was also the original author of Turbo Pascal and the chief architect of Delphi.

https://en.wikipedia.org/wiki/Anders_Hejlsberg