Lennart Guldbrandsson has been a Wikipedian since 2005. He has been the Swedish Wikipedia press contact for four years, president of the Swedish Wikimedia chapter for four years, and a Wikimedia Foundation Fellow, and in 2007 he wrote one of the first books about Wikipedia.

During the start of 2012, he led the work of creating a manual for cultural heritage institutions about publishing on the internet under a free license.

Right now, he is a Wikipedian in Residence at the Swedish National Heritage Board. In his off-Wikipedia life, Lennart is working as a writer and writing coach.