WORCESTER, Mass.--(BUSINESS WIRE)--Advanced Cell Technology (“ACT”; OTCBB: ACTC) announced today that William M. Caldwell, IV, the company’s Chairman and CEO, will present at the Fifth Annual World Stem Cells & Regenerative Medicine Congress to be held May 11 -- 13 in London, UK. The World Stem Cells & Regenerative Medicine Congress is a three-day event that showcases the work of some of the world’s most innovative scientists and executives involved in commercial stem cell research.