Hans Rossel has worked profesionally with Drupal since 2005 and has been teaching Drupal since 2006 to teams of webdevelopers of The Reference/Emakina, Wunderkraut/Krimson, Dataflow, These Days, Mediaraven, DM&S, Hewlett-Packard, the International Trade Union Association, One Laptop per Child project, the Belgian Government (Chancellery of the Prime Minister, FOD Financiën, FOD Binnenlandse zaken), The Flemish Government (webteam vlaanderen.be, Vlaamse Sportfederatie), V-ICT-OR (De Vlaamse ICT Organisatie) and local Governements (Provincie Oost-Vlaanderen, Stad Gent).
He also has been teaching Drupal in the course programs of Acquia and Syntra West and has been a speaker in Drupal user groups, Drupal camps and Drupalcon Copenhagen. He is a certified Acquia Drupal developer.
Next to Drupal he has also been teaching HTML5 and CSS, responsive design, SEO, Photoshop and Webanalytics. He is also a member of the jury of the Webdeveloper course of Syntra West.