Shannon -jj Behrens is a staff software engineer at Twitter, working in the Infrastructure and Operations department. He lives in Concord, California, with his lovely wife and seven lovely children. He's well known for his impeccable sense of modesty, world-renowned taste in T-shirts, and poor sense of humor. He blogs at http://jjinux.blogspot.com on a wide variety of topics such as Python, Ruby, Scala, Linux, open source software, the Web, and lesser-known programming languages.

Cédric Chantepie is an IT system architect, with varied development experience (C/C++/ObjC, LISP, JavaEE, Haskell, and Scala), obsessed by software quality (CI, testing, and so on), and involved in open source projects.