Infosys co-founder and Chairman Nandan Nilekani and his wife Rohini Nilekani have decided to pledge half of their wealth for philanthropy. With this, the Nilekani has become the fourth Indian and second tech magnate from Bengaluru to join The Giving Pledge, the philanthropy movement started by US billionaires Bill Gates, his wife Melinda Gates and Warren Buffett in August 2010.