Hortonworks is a major Hadoop vendor. I have been working for Hortonworks for the last year and has been working on Ozone Object store(an S3 like interface for HDFS). I am a contributor to Hadoop - especially to HDFS.

Anu Engineer : Apache Hadoop Contributor , works for Hortonworks. I have previously worked at Microsoft, working on Windows Azure and at VMware. I have presented in various conferences like FAST and build.

Arpit Agarwal : Apache Hadoop Committer & PMC Member, works for Hortonworks. Regular speaker in Hadoop Summit.