The appointment follows the acquisition of the imprint by Hachette Livre UK, the country's biggest publishing group.
The website will be aimed at consumers, existing and prospective authors and book trade professionals. Due to launch later this year, it will be based on branding developed by design agency Unreal.
Content on the site will include blogs, video, interviews, book extracts, commissioned articles and competitions.
Roger Cazalet, marketing director at Little Brown, said Lateral would help the company 'transform from a business to a consumer website'.