Marko Heijnen is a long term WordPress contributor from the Netherlands. He uses wordPress for more then 7 years and starting contributing back to it in 2009 to already six releases. After years of freelancing he nows works for 1&1 as their WordPress specialist. Part of his job is improving WordPress by contributing back to the community.
He also works on GlotPress as the main core developer and creating a better open source tool for translations. He can be found on twitter @MarkoHeijnen, blogging on markoheijnen.com or wpunknown.com.