Barclays has rewarded one of its senior New York bankers with the reins of its global M&A business, a sign the bank is intent on defending its position in US investment banking following a raft of senior departures.

The UK bank Tuesday named former Lehman Brothers banker Gary Posternack, its head of Americas M&A, as global head of the business. It came as part of a wider reshuffle of its senior leadership in M&A.