David Schaffer is a member of the Scientific Advisory Board of Replay and a Co-founder of Eudora. He is the Hubbard Howe Professor of Chemical and Biomolecular Engineering, Bioengineering, and Molecular and Cell Biology at the University of California, Berkeley, and he also serves as the Executive Director of QB3 and the Director of the Bakar Bioenginuity Hub and Bakar Labs. He received a B.S. from Stanford University in 1993 and a Ph.D. from MIT in 1998, both in chemical engineering. He then conducted a postdoctoral fellowship at the Salk Institute for Biological Studies before joining Berkeley in 1999. There, he applies engineering principles to optimize gene and stem cell therapies, work that includes developing the concept of applying directed evolution to engineer targeted and efficient viral gene therapy vectors as well as new technologies to investigate and control stem cell fate decisions. He has published >240 papers, has advised >90 graduate students and postdoctoral fellows, is an inventor on >50 patents, and developed technologies that are being used in 8 human clinical trials. In addition, he has co-founded eight companies, including 4D Molecular Therapeutics (NASDAQ FDMT), Ignite Immunotherapies (acquired by Pfizer) and Rewrite (acquired by Intellia). Finally, has received recognitions including the National Academy of Inventors, Andreas Acrivos Professional Progress Award, the American Institute of Chemical Engineers Pharmaceutical and Bioengineering Award, the American Chemical Society Marvin Johnson Award, and the Biomedical Engineering Society Rita Shaffer Young Investigator Award.