Declan is a well-known financial journalist and regular contributor to LBC. He spent two decades at the BBC, across both TV and Radio.

He is possibly best known for BBC Breakfast where he presented the business section daily from the London Stock Exchange, and 'Wake Up To Money' on BBC 5 Live as well as the business debate programme 'Show Me The Money' on the BBC News Channel. He co-presented BBC 2's daytime business programme "Working Lunch" , which he co-presented with Naga Munchetty.

He has interviewed chief executives, trade union leaders, stock market watchers and economists, along with individual workers and investors. He has also broadcast his own personalised reports on the stock market and investing. Declan has also appeared coast-to-coast across the United States each morning, with a live business and news report for the US network ABC as well as writing a regular diary column for ABC's news website, ABCNews.com He writes for newspapers and magazines in the UK, Ireland and the United States. He has been published in the "Independent" and "Guardian" newspapers, "Shares" and "Caterer & Hotelkeeper" magazines, "Business & Finance" in Dublin, "The Irish Examiner" in Cork, and "The Ulster Newsletter" in Belfast.