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Dr. John Carter started out as a medical student during the 1st Season of ER. Throughout the series he becomes a very skilled doctor and eventually becomes a full Attending at County General. He was stabbed in the sixth season and became addicted to painkillers, and later checked into rehab. He left at the conclusion of the 11th Season to work in Africa with his wife, Kem. He returns in the 15th Season because he has a failing kidney and starts work again at County General.

Dr. Tony Gates first started out as a paramedic that was treated and helped out with a few cases at County General in Season 12. He became a doctor at County the following season and is currently a Resident. He is raising his girlfriend Meg's daughter, Sarah, after she passed away.

Gates has a relationship with Nurse Sam Taggart throughout Season 14 and early 15, however when Sam and Sarah get into an accident at a party that Tony let them go to, Sam breaks off the relationship and moves out of Tony's apartment.

Dr. Archie Morris originally came into the ER during Season 10 as a First Year Resident who didn't look to have too much of a future at County General. Dr. Morris was continually lazy and possessed little to no work ethic. However, when Dr. John Carter (Noah Wyle) told Dr. Morris that he needs to "set the tone", he finally started to step up.

Leading up to the final season, Dr. Morris started becoming more responsible and taking on bigger cases throughout the ER. Although continuing to be a comic foil, Dr. Morris became a very respectable doctor around his peers and recurring patients.

Dr. Cate Banfield (Angela Bassett) is the new Chief of Emergency Medicine in the ER during the 15th and final season of ER. Dr. Banfield is strictly no nonsense in the ER and makes the rest of the doctors well aware of that fact. The ER nurses claim she looks familiar, but Dr. Banfield informs them that they must be mistaken. However, in the episode "Heal Thyself", we learn that Dr. Banfield brought her son to the ER many years ago and was treated by Dr. Mark Greene (Anthony Edwards).

Dr. Mark Greene was the Chief Resident during the 1st Season of ER and became a full Attending Physician at the beginning of the 2nd Season. His marriage to his first wife, Jen, ended during this time. His daughter Rachel moved to Milwaukee full time with Jen and Mark hardly saw her. During Season 7 he started dating Surgical Attending Elizabeth Corday and soon found out that she was pregnant. They got married soon after and had a baby girl named Ella.

However, personal triumphs aside, Greene faced a brain tumor that was successfully removed during the 7th Season. However, it recovered and during the 8th Season, he died from its return. Dr. Greene would later return in flashbacks a few months before his death in the episode "Heal Thyself" that shows how new Chief of Emergency Medicine Cate Banfield first got introduced to County General.