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The National Gallery leadership quality essay Since stepping into the role following the abrupt departureof John Manzoni last year, Kvisle has put a host of assets onthe block, including the company's holdings in Norway's NorthSea, some Canadian shale-gas fields and its stake in Colombia'sOcensa pipeline. (Additional reporting by Anna Driver in Houston and MichaelErman in New York; Editing by Eric Walsh and Phil Berlowitz)