Biocon Chairperson Kiran Mazumdar Shaw has joined The Giving Pledge, a philanthropic campaign started by billionaires Warren Buffett and Bill Gates. Shaw, the second Indian after Wipro Chairman Azim Premji to join the initiative, has pledged half her wealth towards philanthropic causes. She is among 17 entities to take the pledge since June 2015, bringing the signatories' strength to 154.