A Chief Technology Officer, is an Executive in a company who focuses their time on scientific and technological issues.
That's the broad definiton of CTO, in reality, a CTO's day-to-day responsibilties vary greatly from StartUp to Enterprise. In the book I discuss what I learned in my role as a CTO from ground floor, as a single developer builing "somthing cool", to the CTO of a multi-million dollar company.
Joel has education from MIT, a passion for writing clean code, plays guitar, has a wonderful wife, Michelle, and a lovely baby girl on the way.
Joel currently works at Logic 17