An Anesthesiologist

The job of an anesthesiologist is to give people anesthesia or some other drug to ensure the patient will feel no pain or at least reduce the pain. As the patient undergoes surgery it is their job to make sure all their vitals are in check and to keep administering doses if they need it, Since they don't deal with surgery every waking moment of every waking day, they also help individuals with cancer or other diseases deal with pain they are feeling on a daily basis to make life tolerable. Since they have a doctorate they also have the skills to see patients and diagnose them but this is uncommon unless the hospital is running low on staff.