Extreme skydiver will postpone attempt to break sound barrier until tomorrow Baumgartner's closest confidante is Dr. Jonathan Clark, a former NASA flight surgeon whose wife, astronaut Laurel Clark, died in the space shuttle Columbia accident in 2003. Dr Clark is dedicated to improving astronauts' chances of survival in a high-altitude disaster. This extreme venture is sponsored by energy drinkbrand Red Bull, which has funded similar events. The project's team of experts has a plan for almost every contingency. The spacesuit and capsule were tested in the early skydiving practice runs. But whether Baumgartner can make what he vows will be his final jump depends on the weather. A cold front that brought winds to the area this weekend prompted the team to move the planned Monday jump to Tuesday. "From what we are looking at so far, we are on schedule (for Tuesday)," meteorologist Don Day said at a media briefing yesterday. Weather permitting, Baumgartner will be lifted into the stratosphere around 7am tomorrow by a giant helium balloon. Baumgartner, who has made more than 2,500 jumps from planes, helicopters, landmarks and skyscrapers over the past 25 years, promises this jump will be his last. He says he plans to settle down with his girlfriend and fly helicopters on mountain rescue and firefighting missions in the US and Austria.