He has clocked up 2,500 skydiving jumps, including one in which he became the first person to 'fly' across the English Channel, with carbon-fibre wings strapped to his back.
He has performed various horrifying ‘base jumps’, freefalling off the Christ statue in Rio and leaping head-first into a pitch black, 620ft-deep cave in Croatia.
Baumgartner says his supersonic plunge will be the end of his 'journey' as a daredevil.
Rising: Baumgartner's capsule is lifted by a giant weather balloon
He intends to retire with his girlfriend and settle down to a quiet life - which in his case means becoming a rescue helicopter pilot.
Ahead of his grand finale, he has completed a couple of high-altitude dress rehearsals. In July, he leapt from 96,640ft - just 6,000ft shy of a world record set in 1960 by Joe Kittinger, a U.S. air force test pilot.
The grandfather of stratosphere skydiving, 84-year-old Colonel Kittinger has become Baumgartner’s mentor and will be the voice he hears in his headset as he communicates with mission control before and during the jump.
But a disembodied voice will not protect him against some of the most extreme forces in nature.
‘You can feel in your stomach and every part of your body that it does not want to be there,’ says the Austrian, a former military parachutist, laconically.
The body in question will be encased in a specially designed $200,000 spacesuit. It has an insulating exterior that can withstand extreme temperatures, and an airtight inner layer filled with pressurised oxygen.
It also has one crucial difference to the spacesuits worn by astronauts, which is that it remains highly flexible when it is fully pressurised.
Baumgartner’s visor is fitted with an intensely powerful heat regulator that should keep his view free of fog and frost.
The suit’s 12lb chest pack contains monitoring and tracking equipment together with a voice transmitter so he can talk to mission control on the way down. The pack is connected to a device on his wrist that allows him to monitor his speed and altitude.
The capsule in which he’ll make his ascent is 11ft high and 8ft in diameter, made from fibreglass strengthened by an internal metal frame, and weighs as much as a Volkswagen Beetle.
It was designed by some of the scientists who created the U.S. stealth bomber and is based on the famous Nasa Apollo rocket, but with a few key design differences.
The exit hatch is bigger for a start, designed to prevent the sort of catastrophe that befell Soviet high-altitude sky diver Pyotr Dolgov in 1962. Struggling to leave his capsule in his cumbersome spacesuit, Dolgov cracked his visor slightly on the door.
He was dead by the time he landed, a victim of ebullism, the terrifying condition in which the drastically lower air pressure above 62,000ft makes liquids in the body start to bubble and vaporise, inflating the body and bringing unconsciousness within 15 seconds.
Unfortunately for Baumgartner’s sponsor, Red Bull, he won’t be able to consume any of the fizzy energy drink on the way up.
The air pressure inside the capsule will still be significantly lower than at sea level, and any kind of gas inside his body could prove extremely uncomfortable. The Austrian company won’t say how much it has sunk into the project, but it must surely run into millions.
Weather permitting (the balloon material is so flimsy the ground level wind cannot be stronger than 2mph), the launch will take place on a runway in the New Mexico desert.
A ten-strong team wearing cotton gloves and protective suits to prevent them ripping the fabric will pump helium from two large lorries into a $241,000 balloon that has been hailed as the biggest ever to lift a passenger.
When inflated, it is as high as a 55-story building with a volume of 30