He will head up the digital delivery team at Lowe Open and will be initially responsible for creating content and eCRM programmes for Diageo and e-commerce solutions for Unilever.
Anthony Hopper, chief executive of Lowe Open, said: "Attracting world-class digital talent is a key priority for us and Will is exactly that. He is a highly knowledgeable delivery specialist with a track record in driving efficiencies and ensuring quality in output."
At AKQA, Garwood worked on accounts including Xbox 360, EE and Google.
Garwood said "I was very impressed by the ambition and energy of the team at Lowe Open. The space between digital, data and shopper is full of opportunities and I am looking forward to exciting times ahead."