John-Henri Bertilson Holmberg (born 22 June 1949 in Stockholm) is a Swedish author, critic, publisher and translator, and a well-known science fiction fan.
As a translator, he has rendered Lemony Snicket's and many of Stephen King's novels into Swedish.
Holmberg is a frequent guest on Swedish television and radio for discussions about science fiction and other literature; in 2010, this has often included discussions of his relationship with fellow SF fan Stieg Larsson and the question of whether Larsson left behind fourth or even fifth novels in his series.
[3] In 2011, he published a book in collaboration with Dan Bursteing and Arne De Keijzer, titled The Tattooed Girl: The Enigma of Stieg Larsson and the Secrets Behind the Most Compelling Thrillers of Our Time.
In August 2015 it was announced that he would be one of the Guests of Honor of the 75th World Science Fiction Convention, to be held in Helsinki, Finland.