I think the fact that he has both domain and engineering knowledge. We work in a university hospital and he has both medical training as well as software engin

I think the fact that he has both domain and engineering knowledge. We work in a university hospital and he has both medical training as well as software engineering. So we can talk to him with software specific terminology and doctors etc can do the same with medical terminology. That, combined with having passion about what we are doing and actually caring about the team goes a long way. (Our team occasionally does things outside of work together, like going to the movies or something). The team (and leadership of said team) are one of the best things about my job.