Tucker has worked at DDB since 1999. He was promoted to creative partner in 2004 and creative director in 2006. He will work across a number of accounts at Fallon, although no decision has been taken as to which he will lead.
The Fallon founding partner Robert Senior said: "Adam's work speaks for itself and we're delighted to have him on board."
Tucker added: "Fallon has become the best agency in town without compromising on its ideals. It's one of the few places that can claim 'it's all about the work' and you actually believe it."
During his time at DDB, Tucker led the award-winning Harvey Nichols account. He has won five silver Pencils at D&AD, a Cannes gold Lion and golds at both Campaign Press and Poster awards.
Justin Tindall, Tucker's long-term partner at DDB, left the agency to join The Red Brick Road in September last year.