Bangalore power couple Nandan Nilekani, cofounder of tech giant Infosys, who recently returned to the company as non-executive chairman after a boardroom shakeup, and his wife Rohini, announced over the weekend that they had signed on to the Giving Pledge. Their commitment to give away half their wealth, pegged at $1.7 billion, was made in Bangalore in the presence of Bill Gates, who launched the Giving Pledge with wife Melinda and Warren Buffett seven years ago.