Ashok Vaswani, who built banking businesses for financial powerhouses such as Barclays and Citigroup across continents, will return to India as the first non-promoter chief executive of Kotak Mahindra Bank, harnessing his global expertise to lead a lender that his predecessor — and founder — Uday Kotak had taken to the very top of the valuation leader-board from a modest pre-liberalisation start.