Research In Motion’s joint chairmen and chief executives, Mike Lazaridis and Jim Balsillie, have resigned as part of a long-awaited shake-up at the embattled Canadian maker of the BlackBerry smartphone, the FT reports. RIM said late on Sunday that Mr Lazaridis would continue to play an active role as vice-chairman and head of a new board committee on innovation. Mr Balsillie is leaving the company, but will remain a director. The new chief executive will be Thorsten Heins, chief operating officer for product and sales. Mr Heins, a 54 year-old German, joined RIM in 2007 from Siemens, the engineering group. Barbara Stymiest, former head of the Toronto stock exchange and a senior executive at Royal Bank of Canada, was named chairman. RIM also said that it was seeking a new chief marketing officer. Prem Watsa, a prominent Canadian investor, has joined the board. Reuters says the executives were keen to paint the shuffle as an orderly transition on a succession plan mapped out at least a year ago, and not a retreat in the face of a plummeting share price, shrinking US market share and criticism of their products. Read more