Ferrand, a former media strategist at Naked Communications and OgilvyOne, oversaw the media planning for clients including UNIQLO, Timberland, FT and Fujitsu-Siemens.
At GyroHSR, he will oversee the agency' media planning division, with a particular focus on London Business School, NXP, Nuffield Health and Tate & Lyle.
Swann, who spent five years at JWT and several years in brand consultancy before moving to Mother London, has been behind the brand and communications strategy for clients including HSBC, PG Tips and Boots Opticians.
Working across the T-Mobile, Shell and HP global accounts, Swann will lead the development of planning and strategy across the GyroHSR international network.
The appointments follow that of former DraftFCB creative head Christoph Becker, who joined the agency as chief creative officer in June.
In April, Gyro announced its merger with US agency HSR. The agency now has 17 offices in 15 cities spanning Europe, North America and the Middle East.
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