The agency, founded in March 2017, will be rebranded as Good Relations North and move to a new central Manchester office.
Leah is the former managing director of Weber Shandwick in the English regions and Wales, and was also presented with a lifetime achievement award by the Chartered Institute of Public Relations.
She will join the Good Relations executive team and be responsible for building Good Relations North into a challenger PR and content network.
"This is a hugely exciting time to be joining Good Relations," Leah said. "They are delivering creative work with a focus on driving business performance – and they’re winning the awards to prove it. I can’t wait to get stuck in and do it all again with such a focused team.
Good Relations CEO Richard Moss said: "Jo has a formidable track record of building high performing teams and delivering exceptional client results. I’m hugely excited about bringing together her capabilities with those of Good Relations to create a new dynamic PR force in the north."
Good Relations is part of the VCCP Partnership.