Addi (add1sun) has been involved with Drupal since 2006 and is the current Documentation Team Lead for the project. In March 2009 she was awarded a Knight Foundation grant to improve Drupal documentation. She travels around the world, speaking at events from local high schools to major conferences like OSCON, working to improve Drupal and Open Source software. She is also involved with organizing the Writing Open Source conference to get open source projects together to share ideas about how to improve documentation.

In addition to her focus on coordinating documentation efforts she's provided core patches, maintains several contributed modules, and has been involved with the Drupal Dojo and the Google Highly Open Participation (GHOP) mentoring programs.

In 2010 Addison was recognized as one of the Most Influential Women in Tech by Fast Company Magazine.