You're actually right Benjamin Hindman now CEO of Mesosphere Inc. started what became the Apache Mesos project while a PHD student at Berkeley, He later left Berkeley, interned at Google, then took a full time role at Twitter where he built out Mesos at scale.

His linkedIn bio: Member of the Technical Staff Twitter March 2010 – May 2013 (3 years 3 months) Built out Apache Mesos (http://mesos.apache.org).