Nathaniel Catchpole has been using Drupal since version 4.5, and has been a regular contributor to Drupal core since 2006; along with extensive code profiling, he has contributed over 400 patches to the Drupal 7 release. He also maintains the core entity, cache and taxonomy subsystems, as well as the memcache and entity cache contributed projects. In September 2011, Nathaniel became branch maintainer for Drupal 8. Nathaniel is a co-author of the O'Reilly book High Performance Drupal. He has been with Tag1 Consulting since September 2010.