Marcel P. Bruchez was a recognized leader in developing and commercializing research tools for bionanotechnology - an emerging field that creates or adapts materials and chemical processes to solve biological problems. As a graduate student, he modified quantum dots - nanometer-sized crystal particles - so that they could be used to tag proteins and label cells. Based on this work, he founded Quantum Dot Corporation to develop and commercialize quantum dots for biological applications. In 2005, Quantum Dot was purchased by Invitrogen Corporation, and Bruchez joined the Molecular Biosensor and Imaging Center as Program Manager for the National Technology Center for Networks and Pathways at Carnegie Mellon University. Research in his lab was focused on optical tools for detection of complex biological processes, work the company continues to benefit from. These tools were all designed to investigate biological changes, in real-time, as they occur in living cells and animals, a true innovation.