She has produced, reported, and anchored general news, business programmes and current affairs for BBC World, CNBC Asia, CNN International and Thomson Reuters in London, Singapore and Hong Kong, and was CNBC's Hong Kong bureau chief from 1997-1998. She has also reported for regional Asian networks like STAR News Asia, Channel News Asia and CCTV. Karen also co-produced and hosted a weekly radio show focused on women's social and sexual issues for Radio Television Hong Kong.