The McGregors team will join forces with Fleishman-Hillard from February this year. Meredith Lill, who founded McGregors in 1997, will become senior vice-president of Fleishman-Hillard's healthcare practice in Australia.
Walter Jennings, general manager of Fleishman-Hillard Sydney, said the focus during the integration will be to ensure clients' interests are placed first.
She said: "This is a move that adds depth to our existing offering and bolster the capabilities of our Sydney office in healthcare, consumer marketing, corporate/ financial services and technology. Our clients will benefit from an expanded team and strengthened capabilities."
Lill added that the move presented new opportunities for the McGregors team and its clients, which will benefit from the additional resources of a global agency.