On the 5th of May 1965 Mark Keller was born in Überlingen at the Bodensee. He studied at the drama school in Freiburg from 1985 till 1987. In 1989 he was discovered as a "Dean Martin"-imitator in the "Rudi Carell Show". His break-through as actor was in 1991. After he first played some parts in other series, his career as André Fux began in 1996.

Next to the acting Mark is also busy with music. However by the busy recording-scheme of "Cobra 11" his own music-studio is often empty. The singing-talents of Mark were to be heard once in "Alarm für Cobra 11", when he sang together with H.P., the singer of the band "Scooter".

Because Mark has no time to do other things by the busy recording-scheme of "Cobra 11", he decided to stop playing in "Cobra 11". In episode 46 he was for the last time to be seen as André Fux. The spare time which he got now he spends mainly to his wife Tülin and his two sons Aaron and Joshua. The four of them live together at the Bodensee.