Lynch has been with WE since 1999, spending the last five years in her EMEA role based out of London.
Last week, she returned to the US to take up the position of vice president of the North America tech practice, reporting to executive vice president for the practice, Mel Havel.
The 40-strong London office of WE now has a new head of technology and corporate, Laura Gillen, who has been with the firm since 2011. The addition of corporate to that job title reflects the agency's desire to increasingly work beyond the b2b tech discipline for which it is arguably best known.
UK general manager Marcus Sorour said: "WE-UK has a reputation for quality b2b technology public relations underpinned by integrated capabilities across a multi-channel digital communication ecosystem. We are focused on emulating this strength in order to grow our consumer, corporate and health portfolios through a combination of promoting from within and bringing on new talent."
As such, the agency also has its first UK head of consumer - Gareth Davies, who joined four years ago as EMEA digital lead.
UK clients of WE include Sennheiser Communications, Xerox, Capgemini, the Forest Stewardship Council and recruitment firm PageGroup.
In March, WE's head of technology Dawn Beauparlant was named chief client officer in addition to her tech practice oversight, amid a period of acquisitions and senior hires.
The firm experienced a rebound last year with revenue growth of 4.2 per cent, according to PRWeek's Global Agency Business Report.
This story orginally said Lynch would be head of the firm's North America tech practice - her role has now been clarified