The "world's greatest salesman" has excited investors about Aeris's potential. Now he must perform.

The life-sciences company Aeris Tech-nologies has made a stunning debut on the Australian Stock Exchange. Its shares are up 426% in the past two years to about $1.42. Not bad for an operation that has only just become profitable. But now Aeris, which makes products to clean heating, ventilation and air-con-ditioning systems in large buildings, has to live up to the hype. The chairman, Maurie Stang, must keep international expansion running smoothly and stay ahead of potential imitators.