Barker, who joined BMP as the creative director in 1998, said: "I'm really excited about it. It's a job I've been partly doing for some time.
He added: "Jeremy's and Ewan's promotion is about using everyone to do what they do best, and we'll all be there to help them."
It will be the first time BMP's creative department has been run by two people since Alan Tilby and Paul Leeves left to set up their own agency in 1988.
Craigen was promoted to deputy creative director last October. He joined BMP in 1990 from Bates Dorland as a junior copywriter and was promoted to the board in 1996. His creative highlights have included work for Sony, Budweiser, Optrex, the American Airlines "seat
execution as well as the VW Lupo commercial.
Paterson started his career at Yellowhammer in 1988. He moved to Young & Rubicam in 1990 where he wrote campaigns including Hush Puppies and the Carl Lewis "power is nothing without control
Paterson moved to BMP in March 1995 and has worked on Volkswagen, including the "beautifully crafted
Passat spot and the gold Cannes-winning "driving test". He was made one of the agency's directors of creativity three years ago, and his recent credits include work for British Gas, Sizzle 'n' Stir and London Transport.
Craigen said: "We're absolutely delighted. We have a very good department to work with and we can tap into that talent and follow on BMP's creative heritage."