Karen is the Architect and Technical Lead for the Hotspot Java Virtual Machine Runtime team at Oracle. She began her career in operating systems and networking, and has been working on the internals of various Java virtual machines since 2000. In addition to steering all of the Hotspot JVM Runtime technical development, her recent individual contributions to the JVM have been to value types (Valhalla), modules (Jigsaw), default methods (Lambda), and parallel class loading.