Gillian Louise Kearney (born 9 May 1972, in Liverpool) is an English actress best known for her early role as Debbie McGrath in Channel 4's Liverpool-based soap opera Brookside and the spin-off mini-series Damon and Debbie, and for playing Jessica Harrison in the long-running BBC television medical drama series Casualty, as well as Emma Barton in the ITV Yorkshire-based soap opera Emmerdale. The role of Emma gained her recognition because of character's involvement in Emmerdale’s most high-profile storylines during her three-year stint.