A Chief Physician, also called Head Physician, Senior Consultant

Consultant (medicine)

In the United Kingdom, Republic of Ireland, and parts of the Commonwealth, consultant is the title of a senior doctor who has completed all of his or her specialist training and been placed on the specialist register in their chosen specialty...

, Chief of Medicine, is a physician

Physician

A physician is a health care provider who practices the profession of medicine, which is concerned with promoting, maintaining or restoring human health through the study, diagnosis, and treatment of disease, injury and other physical and mental impairments...

 in a senior management position at a hospital

Hospital

A hospital is a health care institution providing patient treatment by specialized staff and equipment. Hospitals often, but not always, provide for inpatient care or longer-term patient stays....

 or other institution. In many institutions, it's the title of the most senior physician, but it may also be used as the title of the most senior physician of a particular department within a larger institution. A Chief Physician generally is in charge of medical matters and often is the superior of other physicians (including Consultants

Consultant (medicine)

In the United Kingdom, Republic of Ireland, and parts of the Commonwealth, consultant is the title of a senior doctor who has completed all of his or her specialist training and been placed on the specialist register in their chosen specialty...

 or Attending physician

Attending physician

In the United States, an attending physician is a physician who has completed residency and practices medicine in a clinic or hospital, in the specialty learned during residency. An attending physician can supervise fellows, residents, and medical students...

s), but may also be in charge of other professional groups and areas of responsibility.