# Presentations ## How to Contribute to Apache Usergrid - David Johnson, [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