A network security expert by trade, Domscheit-Berg is an advocate for transparency and freedom of speech by heart, deeply caring for equal access to knowledge and information in a globalized world. Foreign Policy Magazine named him a Top 100 Global Thinker in 2011. He helped build the WikiLeaks platform from late 2007 to September 2010, and acted as its spokesperson under the pseudonym Daniel Schmitt. He quit WikiLeaks over disputes about its strategic orientation, lack of transparency and management style. Domscheit-Berg wrote a book about his experiences "Inside WikiLeaks“, which was published in early 2011, was translated into 23 languages and was one source for the subsequent Hollywood movie "The Fifth Estate".