WS has restructured the UK corporate practice, merging it with areas of its PA team to form three units: strategic media relations; international affairs; and crisis, issues and corporate reputation.
Michael Prescott and Peter Morgan will co-lead the media relations arm, David Walker and Joanne Milroy will lead crisis and issues, while Marcus Smith and Marcus Courage head international affairs.
PA survives as a standalone practice and will continue to be led by joint MDs Nigel Clarke and John McLeod.
WS joint CEO Colin Byrne said five people had been made redundant from the corporate team in response to deteriorating market conditions for the corporate and public affairs sectors.
Curtis departs two months after returning from maternity leave. Byrne said WS discussed the possibility of a role for her within the group, but she decided to pursue other options.