Kathy comes from Belfast and began her broadcasting career as a TV announcer at BBC Northern Ireland. She left to work for Radio Netherlands, the Dutch International Service, for a few years; this led to freelance work at BBC World Service and eventually a move to London in 2006 to work for BBC Radio 4.  She continues to present on the World Service and on the digital station Radio 4 Extra. For many years she was the Posh Radio 4 Lady (PR4L) on The Scott Mills Show on Radio 1.

Kathy has narrated many TV documentaries, including the annual film about the Nobel prize winners which is shown in the Institute itself and on television around the world. With the Kensington Chamber Orchestra she has narrated Peter and the Wolf, The Three Little Pigs, The Owl and the Pussy Cat and We're Going on a Bear Hunt, and made a guest appearance at the Proms in in Tavener's The Whale. 

She provided all the female voices for the satirical radio and TV programme The Folks on the Hill (BBC Northern Ireland) for 10 years until the untimely death of its star Sean Crummey.

Other voice work includes the animated film Ciderpunks with Mark Radcliffe, the French duo Laurent & Lewis's dance hit Dansen is Leuk, and many documentaries, jingles, trails and adverts for clients such as Philips, Vodafone, Nokia, Co-op, Stena Line and House of Fraser. If you have a certain brand of SatNav in your car, she will tell you in no uncertain terms where to go.

October 2014 saw the premiere of But First This: A Musical Homage to Radio 4  at the Watermill Theatre, Newbury - book & lyrics by Kathy, music by Desmond O'Connor.