The multibillion-dollar food manufacturer has returned to UM, which last held its media account in 2011.
Gittings started his career in the UK before moving to the US in 2015
IPG Mediabrand agency Initiative currently handles media buying and planning.
Wavemaker takes Americas and global work while Publicis Media wins EMEA and Japan.
Frances Ralston-Good succeeds Josh Krichefski, who recently took a Group M role.
Carat has been incumbent in Europe for nearly three decades.
Sasha Savic takes up the role and will report to IPG Mediabrands chief Eileen Kiernan.
The brief includes repositioning brands within Jaguar Land Rover as an all-electric luxury manufacturer from 2025.
Advertisers must avoid the temptation of monthly re-plans and short-termism if they want to come out of the recession stronger.
Retaining a client can be more difficult and rewarding than winning a new account, especially during challenging times. At Wavemaker,