David Lagercrantz is a Swedish journalist and bestselling writer, born on September 4, 1962. He is particularly known for authoring I am Zlatan Ibrahimovic and The Girl in the Spider's Web, the fourth installment in the Millennium series. Lagercrantz is also a columnist for the Swedish newspaper Expressen.

His first book was published in 1997, a biography of the Swedish adventurer and mountaineer Göran Kropp. In 2000, his biography on the inventor Håkan Lans, titled A Swedish Genius, was published. His breakthrough as a novelist was Fall of Man in Wilmslow, a fictionalized novel about the British mathematician Alan Turing.

In Lagercrantz's writing, a common theme is major talents who refuse to follow convention. He has explored not only what it takes to stand out from the crowd but also the resistance such creativity inevitably faces.

In 2011, his best-selling sports biography I am Zlatan Ibrahimović was published, which became one of the most successful books in its genre.