Dr. David Hay is the Chair of Tissue Engineering at the University of Edinburgh, where his group is defining novel ways to produce liver tissue from PSCs. They use in vitro derived tissue to better model human liver physiology and to develop supportive cell based therapies for disease. Dr. Hay also founded Stimuliver, a company that is developing a disruptive liver implant to treat critically failing liver function in humans. He talks about hepatocyte differentiation, liver disease modeling, and automating the production of cell therapies.