Daniel Ivandjiiski (Bulgarian: Даниел Иванджийски, born 8 November 1978) is a Bulgarian-born, U.S.-based former investment banker and capital-markets trader, and currently financial blogger, who founded the website Zero Hedge in January 2009, and remains its publisher and main editor.

[3] In September 2007, before the FINRA ruling, Ivandjiiski moved to the Connecticut-based hedge fund Wexford Capital LLC, run by former Goldman Sachs traders.

[6][7] Ivandjiiski decided that he, and all other Zero Hedge contributors, would blog under the collective pseudonym "Tyler Durden" (a character from the book Fight Club).

[1][7] The New York article made assertions regarding Ivandjiiski's background, particularly his Bulgarian citizenship, his FINRA charge and lifetime ban from securities trading, and his father, Krassimir Ivandjiiski's, own controversial news and political website, Strogo Sekretno (Bulgarian: Строго секретно; English "Top Secret"),[a] and Krassimir's position in the pre-1990 Bulgarian-Soviet administration".

[1] Apart from a brief period in which Ivandjiiski worked for Los Angeles-based investment bank, Imperial Capital LLC, he has spent most of his time since living in the New York metropolitan area.