Dr. Nathaniel Grant can be actually really a pioneering organ-transplant physician who chooses risks that other doctors would perhaps not to be able to conserve the lives of their patients. He works with his ex-wife, Kate Armstrong, with whom he's a relationship, an coordinator. Grant's arrogance and openness to carry out risky procedures causes one to butt heads. But his focus is really on his intense connection with his coworkers and his job, often at the cost of his family.