Who am I? Googler, developer, co-creator of Dagger 1.x and 2.x, the Truth testing and assertion framework, and a variety of smaller things or changes to existing things in the Java open-source space.
I've done Agile for large chunks of my career, and done a test-forward approach, whether acceptance or unit (or both, as relevant). My old consulting firm is to be found at http://www.israfil.net/, though I am now working for Google. I've also worked for Sun, Oracle, Deloitte, and a host of banks and financial institutions.