From Red Hat
Vlad Mihalcea is a Hibernate Developer Advocate working for Red Hat. He is passionate about enterprise systems, data access frameworks and distributed systems.
He blogged over 60 articles about Hibernate on vladmihalcea.com and he has a gold badge for the Hibernate tag on StackOverflow.
He's currently writing the High-Performance Java Persistence book (https://leanpub.com/high-performance-java-persistence).