The pair had been at AMV since 2003, where they worked on accounts including Guinness and The Economist.
Among the campaigns they created there were Guinness' "moon", "Einstein" and "PS2" press ads, which won bronze awards at Cannes last year.
The duo were also behind print work for The Economist, including "stuck in a lift", a finalist in the 2005 Campaign Poster awards, and the "meeting of minds" ad that asked: "In a meeting of minds, would you be sent out for the biscuits?"
The pair started their career at Ogilvy Advertising and moved to Faulds London in 2002 before joining AMV.
Jeremy Craigen, DDB's executive creative director, said: "Christian and Andy show incredible potential. They both have remarkable craft skills and with the great training they've received at Ogilvy and AMV, DDB is hopefully the best place for them to realise this potential."