Gisborne worked at MHP for nearly three years before leaving in February this year. He began at FHF last week and reports to CEO Jim Donaldson.
He joined MHP from Hill+Knowlton Strategies in early 2013, after Sarah Winstone and Mike Birtwistle quit what was then known as MHP Health Mandate to form Incisive Health.
An FHF press release said Gisborne "will be joining the executive committee and will be working closely with the healthcare team to build the business into an even bigger powerhouse within the FleishmanHillard global network".
Gisborne said: "The health sector is currently responding to so many technological advancements and possibilities, with great expectation from society. In these times, effective communications is all-important and we are well placed to help current and new clients expand the impact it can have on their businesses."
In addition to health and pharma work, Gisborne has also advised businesses in energy, supply chain and FMCG sectors. He has a degree in biochemistry and is a trustee of the Familial Hypercholesterolaemia charity International FH Foundation.
FHF was created by a merger in November last year. Before this, Daniel Kent was head of healthcare PR at Fleishman, but left following a decade at the firm to pursue interim and consultancy opportunities and a career outside of PR.
MHP's UK and global health teams are now combined under Rachel Rowson, who previously led the 25-person UK team, while Gisborne's global team had seven staff.