# Presentations & Videos ## Building Mobile Apps with Apache Usergrid - Screen-cast of a talk given by Dave Johnson at the All Things Open 2014, Raleigh, NC. ## How to Contribute to Apache Usergrid - David Johnson at [ApacheCon NA 2014](http://apacheconnorthamerica2014.sched.org/event/29971aabd3c86398be2ae93403c7d1d2) ## Apache Usergrid Internals - Sungju Jin ## Open Source Mobile Backend on Cassandra - Ed Anuff ## Usergrid Overview - Ed Anuff