Horizon Discovery Group plc announced the appointment of Dr. David Smoller, Chief Business Officer of Horizon, as an Executive Director of the Board, with immediate effect. David recently joined Horizon as Chief Business Officer as part of the company's recent acquisition of Sage Labs for $48 million (£29 million). David was previously Chief Executive Officer of Sage Labs, Chief Scientific Officer of Sigma-Aldrich and President of its Research Biotechnology business unit.