http://google.com
I spent 4 great years at Google and am very grateful for the opportunity to have worked there.
Amazon.com
http://amazon.com
My first job out of college was with amazon.com. An amazing, fascinating, and innovative place to work.
First Descents
http://www.firstdescents.org/
First Descents is a non-profit that offers free week-long outdoor adventure camps (e.g. kayaking, rock climbing, etc.) to young adults with cancer.
Factual
http://www.factual.com/
Started and run by friends and former colleagues of mine from Google, Factual is doing great work in the area of structured data. Also, they very kindly provided the office space for my web series, "The Consultants"!