Kotak, the 64-year-old founder-promoter of Kotak Mahindra Bank, is the richest banker in the country by virtue of owning 26 per cent of the bank which was valued at over Rs 3.5 lakh crore as of Friday's close. The private sector lender he founded is the only one sporting the family name, and till Friday, had a family member at the helm as the managing director and chief executive officer in an industry where professional managers have the strongest currency.