Ryan Weaver is the single biggest contributor to the Symfony2 framework's documentation (which is excellent, check it out!), a self-described Symfony evangelist, and lead at KnpUniversity.com, makers of fantastic PHP tutorial screencasts like this one on using Composer to include PHP libraries in Drupal 7.
Read the full post and see the conversation video at the Acquia Developer Center: https://dev.acquia.com/podcast/122-ryan-weaver-and-jeffrey-mcguire-compare-notes-open-source-22