He is the author of the Java Microbenchmarking Harness (JMH), a project to examine the performance of Java coding constructs. Prior to JMH, programmers wrote their benchmarking harnesses fraught with errors. He wrote JCStress, a toolkit for testing concurrency code. He also developed a Java-Object-Layout, JOL, which uses Unsafe, JVMTI, and Serviceability Agent (SA) heavily to decode the actual object layout, footprint, and references. Aleksey is now a committer to the new GC project Shenandoah. He is very active on mailing lists like Java Concurrency Interest, JMH, and OpenJDK projects. Follow him on Twitter @shipilev