Cosmas Giallourakis is a serial physician-scientist entrepreneur having been on the founding team of eight companies. He currently serves as a Venture Partner at RA Ventures, the company incubation arm of RA Capital. Cosmas brings over a decade of leadership experiences at the interface of basic science, drug development and clinical care. After being an Assistant Professor at Harvard Medical School combining patient care with basic science research in his laboratory, Cosmas joined Takeda Pharmaceuticals where he was the Head of Cell and Gene Therapy for the gastroenterology pre-clinical therapeutic area. Subsequently, as an Entrepreneur in Residence at Third Rock Ventures, he helped build multiple companies including Septerna (GPCR focused; IPO 2024) and Asher Bio (cis targeted biologics; >100M raised) and Trace Neuroscience (ALS focus; 100M Series A 2024). In addition, Cosmas was a founder and founding CEO of a circular RNA company funded by Arch/a16z, which was acquired by Orbital Therapeutics. At RA Ventures, Cosmas has founded multiple companies currently in stealth stealth ranging from cancer biologics to in vivo CAR-T programming, while in some instances taking operational roles such as interim President/CSO. Cosmas’s academic research has been published in journals such as Cell, Science, and Nature. Cosmas received his BS in Physics from Massachusetts Institute of Technology and his MD from Rutgers-New Jersey Medical School. He completed his residency in internal medicine at Yale-New Haven Hospital and completed his clinical gastroenterology at Massachusetts General Hospital.