Daniel Henrotin was born in Marche-en-Famenne in 1943. After studying at the Art School of Liège, he started working as a comics artist in 1966, as an assistant for Mitteï, an artist working for Tintin magazine. Dany worked there for a year and then had to leave in order to do his military service.
Afterwards, he started collaborating directly on Tintin magazine with illustrations and short stories, and worked in the studio of Greg, the editor-in-chief of the magazine. Greg wrote a poetic story about Olivier Rameau and the people of Dreamland, and it marked the debut of Dany's first successful and longest running series. Dreamland is very similar to the worlds of L. Frank Baum's Oz and Lewis Carroll's Alice and Dany drew an adaptation of Alice shortly after starting the Olivier Rameau series.
Much of Dany's early work was drawn in a comical style, but in the late 1970s he produced more realistic drawings while in collaboration with writer Jean Van Hamme. This included Histoire sans héros ("Story Without a Hero") in 1977, which was a one-off adventure story about the survivors of a plane crash trying to find a way out of a dense South American jungle. It obtained critical success and reached a wide audience. Dany and Van Hamme also came up with a series called Arlequin, the adventures of a freelance secret agent and master of disguise made in the spirit of The Persuaders! which was very popular in continental Europe.
Meanwhile Greg and Dany would collaborate on some other short-lived series, and in the 1990s Greg wrote the final two stories of Bernard Prince for Dany after Hermann had quit the series. (a character based on Prince had featured in one of the Arlequin stories).
But his main commercial success came in 1990 when he started a series of erotic joke comics with Ça vous intéresse?. The series was an instant success, and many artists and writers have collaborated on the books, magazines, and multimedia that have followed since.