
The account was previously handled by M&C Saatchi, the agency that Moszynski and Jarvie left last year.
London will work on the group's "fan" global campaign and on local advertising for every Mandarin Oriental hotel worldwide. It will also create advertising for the launch of a further 18 hotels currently under development, and handle digital advertising and direct mail.
Moszynski said: "Our aim in setting up London was to create an agency that would be able to cater to the requirements of global advertisers in any market. We are thrilled to have secured the confidence of a brand of the calibre of Mandarin Oriental."
Jill Kluge, the director of communications of Mandarin Oriental Hotel Group, added: "For the past ten years Mandarin Oriental has enjoyed an excellent relationship with Michael Mozsynski and Alan Jarvie who created our award-winning global 'fan' advertising campaign. We look forward to working with them again in their new business model."