Chemist turned biochemist turned software engineer.

• First language: PDP-11 assembly (still the best!)
• Most used language: C++ (with boost and C++11)
• Career:
  • 1996: scientific software (phys. chemistry)
  • 2000: OS development (hard real-time/military)
  • 2002: scientific research (biochemistry)
  • 2005: real-time C++ (transportation/city infrastructure)
  • 2012: large scale C++ (finance)

Once upon a time I published a book on x86 assembly language (in Russian)

I edit http://cppreference.com a lot.