Simon Holt was the paramedic who brought Locke to St. Sebastian Hospital in an ambulance after Desmond's hit and run. He told Ben that Locke exhibited no responses. Ben told him that he barely knew him and didn't know who should be contacted as next of kin. ("The Last Recruit")
He was credited as EMT No. 1
An 'emergency medical technician' (EMT) is a health care provider trained to provide pre-hospital emergency medical services.
His name was seen on his nametag, which also described him as paramedic
The casting call described him as "[EMT] Male, any ethnicity, late 20s - 40s. Smart, clean-cut and skillful EMT who cares about his patients and likes helping people...CO-STAR."