Martin Kleppmann is a software engineer and entrepreneur, and author of the O'Reilly book Designing Data-Intensive Applications (http://dataintensive.net), which analyses the data infrastructure and architecture used by internet companies. He previously co-founded a startup, Rapportive, which was acquired by LinkedIn in 2012. He is a committer on Apache Samza, his technical blog is at http://martin.kleppmann.com, and he's @martinkl on Twitter.