His first role was reading scripts for the independent producer
Verity Lambert, and he became her
script editor at
Cinema Verity, working on popular dramas such as
Class Act. In 1996 he moved to
Carlton Television, where he transformed the drama
London Bridge into a twice-weekly soap. De Keyser joined the
BBC in 1997 as series script editor for
BBC One's popular long-running drama
Casualty. He quickly rose to become producer and then series producer in 1998. In 2000 he was made Executive Producer for BBC Drama Series, where he launched the first series of
Waking the Dead, which gained an
International Emmy nomination in the Best Drama Series category in 2003. He also executive produced two series of the BBC THREE comedy
Grease Monkeys. ==Personal life==