The self-taught comic artist Daniel Koller was born in Geneva and published his first short stories in comics magazine À Suivre. He initially published under the pen name Bader K, but later signed with his own name. Upon the demise of the magazine, Casterman published Koller's first book, 'Les Tribulations de Luc Lafonaine' in 2000.
He began a long and fruitful collaboration with scriptwriter Stephen Desberg, that started with 'Mayam', a science fiction series published by Dargaud between 2003 and 2007. Koller subsequently drew an installment in Desberg's series 'Empire USA', before the team embarked on two books in the 'I.R.$.' spin-off series 'All Watcher' for Lombard in 2010 and 2011.