In 1997, Norberg was contacted by the Swedish liberal think tank Timbro, who invited him to write a book about the Swedish author Vilhelm Moberg. The book, "Motståndsmannen Vilhelm Moberg", sold well and sparked much debate which allowed him to write another book, on the history of Swedish liberalism. This book, "Den svenska liberalismens historia", also became a success and in 1999 Norberg joined the permanent staff of Timbro. From 1999 to 2002 he was assistant editor-in-chief of the webzine Smedjan.com. In 1999 he started the website Frihandel.nu to put forward the case for free trade and open economies.