The number of people working on xenotransplantation in the world is very small. My mom (https://tts.org/74-ixa/889-ixa-in-memoriam-agnes-marie-azimz...) was part of the group who conducted basic research in xeno at the University of Maryland and established the collaboration to start testing Revivicor's genetically modified pigs, before her lab (https://www.massgeneral.org/transplant/cts/research/pierson-...) moved to Boston a few years ago.

The international xenotransplantation community found out about David Bennett's heart transplant through the news, and some people feel as though competition between groups may have contributed to a lack of sharing of clinically relevant information that could have benefited Mr. Bennett.