Long before I joined the company, Brad Abrams was one of the first people for me that put a human face on Microsoft.
I felt sad when I just read his blog post that Brad is leaving Microsoft. But at the same time I feel happy for all that he has accomplished for the company. Check his blog post for all that he has been involved in. Not on the list, but not less important in my mind, is the book Framework Design Guidelines that he co-authored.
Brad, I wish you all the best in your next endeavors.