The job duties of an emergency department technician (ED technician) focus on providing support and patient care in an emergency room (ER) or similar critical care setting. Your responsibilities in this career may vary depending on the needs of the department, the medical situations with which you deal, and the preferences of physicians and other medical staff. You may work to assist a nurse or physician in providing emergency care, or you may provide transport to the hospital in an ambulance and offer essential medical care en route. In an ER, an emergency department technician works under the supervision of a doctor or nurse.