Her remit covers marketing, events, strategic partnerships and supporting Manifest’s international expansion plans; the agency opened an office in New York in January.
Champeneri, who oversaw business development at M&C Saatchi Sports & Entertainment, is Manifest’s second senior hire in two months following the appointment of Jemma Holliday as associate director in June. The agency now employs 20 people in London.
Alex Myers, founder and CEO of Manifest London, said: "Trish is an amazing capture for Manifest, bringing with her a host of skills and experience that will help us to achieve our ambitious plans for the next five years and beyond.
"Trish is a big part of continuing to look for ways to grow and evolve as a business."
Champeneri said: "It’s so exciting to be part of a company this inventive and ambitious, and I already feel like part of the family."
The agency has recently started working with online marketplace Gumtree and will be involved in promoting its sponsorship of BT Sport football coverage, and in January announced plans to open a New York office.