Robert has worked with Drupal, full-time, since 2004. He wrote the first book that was published about Drupal ("Building Online Communities with Drupal, phpBB and Wordpress"), has been the technical editor of all three editions of "Pro Drupal Development", was a contributing author to “The Definitive Guide to Drupal 7”, has contributed to "Building e-commerce Sites with Drupal Commerce Cookbook", and recently wrote the foreword for two books on Drupal and e-commerce.

Robert was one of the first members of the Drupal Association General Assembly, a position he held from 2006 to 2011. In 2008 he co-founded the Drupal-Initiative, Germany's non-profit for the promotion of Drupal. After 2-year tenure as the Vice President of that organization, he helped coordinate the election of a new Board and handed over control in 2010.

As a developer he is best known for his contributions to the Memcache and Solr modules.