Welcome to Michael Hartl's Home on the Web! You found your way here—you might as well stay a while. I wear several different hats, and if you poke around this site you'll get to know about a few of them.
These days I mainly work as an educator and entrepreneur. Most recently, I started a publishing platform called Softcover based on the technology toolchain and business model used for the Ruby on Rails Tutorial, one of the leading introductions to web development. The Ruby on Rails Tutorial consists of the Ruby on Rails Tutorial book and the Ruby on Rails Tutorial screencasts. The book is available for free online as HTML, and ebooks and screencasts are available for purchase at railstutorial.org. In addition, the print edition of the Ruby on Rails Tutorial is available at Amazon.com.
Incidentally, I have a sister, Dr. Katherine Johnson, who is an ophthalmologist in Fairbanks, Alaska. If you ever need cataract surgery in Fairbanks, she's the one to see. (My sister helps take care of my eyes, and sometimes I help her with search-engine optimization.)