He served as chairman of U.K. Shell (a major biofuel player), chairman of the wind company Falk Renewables, and a board member of Climate Change Capital, a major investor in carbon credits.
Tax authorities in recent weeks served notices on oil company Royal Dutch Shell PLC and U.K.-based Vodafone Group PLC saying they owe higher taxes than they paid because they undervalued the transfer of shares between their Indian subsidiaries and other overseas units.