Telegraph Media Group (TMG) has appointed Mike Seery as its new chief information officer. Seery, who was heavily involved in the Economist’s launch online, will take up the post on 8 November 2010.

Richard Halstead, who is already at TMG, has been promoted to group chief technology officer, reporting to Seery.

The group is replacing Paul Cheesbrough, who joined News International as CTO and is one of a host of digital executives to leave TMG for its Wapping-based rival this year, led by the departure of former Telegraph editor Will Lewis.

Meanwhile, the Guardian Media Group (GMG) has named Darren Singer as its chief financial officer. Singer takes on the role from Andrew Miller, who was promoted to CEO in July following Carolyn McCall’s departure. He joins GMG from WPP-owned global agency network GroupM where he was chief financial officer for Europe, the Middle East and Africa (EMEA).