Defence technology group QinetiQ Group has appointed Steve Wadey as its new chief executive (CEO) to replace Leo Quinn on Monday.Wadey, will leave his post as managing director of missile system business MBDA UK, to join the company in the second quarter of the current financial year and will receive a basic annual salary of £560,000, the group said in a statement.David Mellors, the current interim CEO, will continue in his role as chief financial officer.QinetiQ shares were down 0.13% to 189.75p on Tuesday.