Stephen Colebourne is a member of technical staff at OpenGamma, building an open-source platform for financial analytics. He has been working with Java since version 1.0 and contributing to open source software since 2000. He has made major contributions to Apache Commons and created the Joda open source projects including Joda-Time. He blogs on Java topics and is a frequent conference speaker. He is currently co-spec lead on JSR-310 and a contributor to discussions on language change such as Project Coin, Lambda and the Fantom language. He is a member of the Apache Software Foundation, a Java Champion and a JavaOne rock star speaker.