Cooksley, who was articled at Winckworth Sherwood, will now head the firm’s planning team, which includes existing partner Sara Hanrahan and Anjana Ghosh, the statement said.
It added that McCormack will be based in a new Winckworth Sherwood office in Manchester.
Managing partner Roger Fitton said: "I am delighted that Karen, Colette and Lindsay will be joining our existing planning team. They are well known and well respected in many of the areas that the firm already practices in and will add considerable weight and depth to those areas."
Field Fisher Waterhouse said that it still has a planning team of three - partners Lesley Webber and Joe Payne and solicitor Claire Brodrick.