American Medical Response is the sponsor. To be clear this is NOT a traveling team. AMR will provide a paramedic and a MD to ride with the Track Services Coordinator, the two officials who arrive in the white pick up. Those two officials are career Fire Fighters and EMS providers such as EMT'S or Medics. The MD and Medic from my understanding could be different from state to state.
NASCAR provides training for all disciplines of track services Fire, EMS, wrecker, clean up, pit road fire etc. This training is extensive in classroom.and practical sessions. Then each track normally has their own training they are required to work a National Series Event.
In the care center, NASCAR has a medical liason who works with the staff to provide detailed medical history and information to the staff. Each National Series has their own who travel with that series.
Since 2004 NASCAR has improved the service provided to the teams and competitors. This service combined with the improvements in safety, while still dangerous, drivers are receiving quality care within seconds of the crash.