Paris-born Didier Teste, better known as Dieter, had no intentions of becoming a comics writer until he met Jean Léturgie. Dieter wrote his first stories for artists like Bruno Bouteville, Marc Malès and Thierry Robin, that were mainly published in Triolo in 1985 and 1986. In the following year, he began a fruitful collaboration with the publishing houses Milan and Bayard Presse. He wrote a great many stories and adaptations for magazines like Diabolo, Mikado, Astrapi, Okapi, Je Bouquine and I Love English, that were drawn by Olivier TaDuc, Christian Rossi, Dominique Rousseau, Raymond Poïvet and Pierre Frisano. His first long story was 'La Déesse aux Yeux de Jade', created with Michel Plessix and published by Milan in 1987.
Dieter and Plessix created 'Les Aventures de Julien Boisvert' for Delcourt in 1989.
In addition, he created the adventure series 'Sark' with TaDuc (Glénat, 1991) and the graphic novel series 'Névé' with Emmanuel Lepage (Glénat, 1991-1997). He wrote the sole episode of the series 'Le Griffon' for Michel Durand and the publishing house Alpen in 1992. He co-wrote the fantasy series 'Labyrinthes' with Serge Le Tendre for artist Jean-Denis Pendanx (Glénat, 1993-1997). He also teamed up with Florenci Clavé to create 'Voyages en Amertume' for Vents d'Ouest between 1992 and 1994.
With Emmanuel Moynot, Dieter created comics like 'Le Temps des Bombes'