 Sergeant began her career starting as a BBC radio researcher in 1993, after completing her postgraduate training at the Centre for Journalism Studies at Cardiff University.She progressed quickly through the ranks, becoming a TV reporter specialising in live outside broadcasts, then a senior TV presenter with BBC Wales.Since joining GMTV, Sergeant has reported on a wide variety of national and international news stories, from the Kosovo War in Macedonia to New York Fashion Week and the Grammys in Los Angeles.