Quick searching produces:
"Bradshaw and Slonsky are paramedics from California that were attending the EMS conference in New Orleans. Larry Bradshaw is the chief shop steward, Paramedic Chapter, SEIU Local 790; and Lorrie Beth Slonsky is steward, Paramedic Chapter, SEIU Local 790.[California]"
I found previous references to Bradshaw confirming who he is, in some EMS-oriented websites. E.g.
http://www.jems.com/jems/exclus03/f0101b.html
And there was in fact a paramedics' conference in New Orleans at that time.
So I suspect the authors do in fact exist, are in fact EMTs, and were in fact in New Orleans. Whether they are truthful or lying, I guess you have to judge. You could do some further research and report back to us.
BTW, in searching I ran across this website
http://www.emsnetwork.org/ which has all sorts of interesting first-hand accounts by EMTs in New Orleans.