Danijel Zezelj was born in Zagreb, Croatia. He started publishing comics during his first year at the Academy of Fine Arts in Zagreb. Since 1986, his comics have appeared in various magazines and anthologies in ex-Yugoslavia, Croatia, England, Switzerland, France, Italy and the USA. He has authored thirteen graphic novels and short comic collections. He moved to London in 1991 and then to Montepulciano, Italy the following year. In 1993, Editori del Grifo published his first graphic novel, 'Il Ritmo Del Cuore'.
In 1995 Zezelj moved to Seattle, where he began working for The New York Times Book Review and DC Comics. He has illustrated various short stories for DC Comics/Vertigo, and his work has appeared in the anthologies 'Weird War Tales', 'Gangland', 'Heart Throbs', 'Strange Adventures' and 'Flinch'. His illustrations are published in The New York Times Book Review, the San Francisco Bay Guardian, the Stranger and the Washington Chronicle.
In 1998 Mosquito Editions began publishing Zezeljís graphic novels in France. He also started creating mini-series for DC Comics/Vertigo. Since 1997, he has created a series of multimedia performances in collaboration with musician/composer Jessica Lurie and writers/pilots Greiner & Kropilak.