Well, looks like you have a very unique background. Though there're certian industries (e.g., consulting, ibanking) that have more admits to MBA, HBS is open to people with a variety of background. So I wouldn't say that you have a clear disadvantage from your past experience.
However, regardless of your background, all successful applicants need to demonstrate their leadership potential, and preferrably their passion for or past involement or experience with business situations. You may want to spend some time sharpening yourself in these areas.