He is the primary author of Strider, an Open Source Continuous Delivery platform.
He previously worked on Freebase.com, a "public database of all the world's knowledge" (acquired by Google in 2010) and was an OpenBSD project committer.
Peter has worked at a variety of start ups on a handful of technology stacks. Most recently he helped Yammer's rapid growth by architecting viral features - he created their chat feature. He's the creator of the node-opencv bindings, node-ical, and a handful of other libraries.