Barber, the head of TV at Mother, will be tasked with driving creative effectiveness across TV, branded content and digital.
With more than 20 years of experience at agencies and production companies, Barber has most recently been responsible for the creative output on Mother clients such as Ikea, Moneysupermarket.com and Stella Artois.
Before joining Mother in 2008, he worked at a number of production houses including Another Film Company. He was also a producer at Bartle Bogle Hegarty and Leo Burnett.
Russell Ramsey, the executive creative director at JWT London, said: "Laurence brings a wealth of energy and experience in integrated production to JWT and we are very excited to welcome him on board."
Falco, JWT’s head of output and production, quit the agency in February after two years to join Adam & Eve/DDB as its head of integrated production. Falco had previously worked at The Moving Picture Company.
Barber will join JWT at the end of June.