Stephen Colebourne has coded Java since JDK 1.0 and been an open source advocate since 2000. His day job with OpenGamma allows him to build open source market risk software for the finance industry (Strata). He is best known for his work on date and time, developing Joda-Time and leading JSR-310 that created the Java 8 java.time.* package. He also contributes to OpenJDK discussions and tries to guide Java forward. He is a Java Champion and JavaOne Rock Star speaker.