We do not have a "Medical Director" per-se in the American sense
Here in NZ we have a big ambulance service and a little ambulance service plus the Defence Force Medics. The big ambulance service has a Clinical Management Group which consists of four Physicians consisting of one dual Consultant Anaesthetist/Intensivest who is the "Clinical Director" and three Consultant Emergency Physicians; the little ambulance service has a "Medical Director" who is a Consultant Emergency Physician while the Defence Force has a Consultant General Practitioner who is the Director General of Defence Forth Health. Each of the three entities looks after clinical issues specific to their service.
Scopes of Practice for each level (Technician, Paramedic and Intensive Care Paramedic) and the Clinical Practice Guidelines are nationally agreed to between the two services and the Defence Force and national issues such as these are addressed through the National Ambulance Sector Clinical Working Group which consists of three members of the big ambulance services' clinical management group, the clinical manager of the big ambulance service who is an Intensive Care Paramedic, the medical director and clinical manager of the small ambulance service plus the defence force GP and one or two other clinical types.
The clinical director for the big ambulance service is an absolutely brilliant gentleman, he has taken the ambulance service leaps and bounds and so far from where it was ten years ago it's not even funny. He is a dual qualified Consultant Anaesthetist and Intensive Care Medicine specialist (FANZCA/FJCICM) and has forgotten more about medicine than I can ever hope to know! He's one of the most approachable and down-to-earth people ever and will go out of his way to help where he can, although he managed clinical issues with his team for over 3,000 Ambulance Officers so might tell you politely to talk to a more appropriate person but he will always respond to you personally. I have much respect for him and think he does wonderful work, because he does!
Man love for Tony Smith or what right here?