When you watch the video from the start of last February’s Empire State Building Run-Up, an 86-story stair race, one man stands out. Thomas Dold, a 28-year-old German wearing Bib No. 1, is already a few inches ahead when the starting horn blasts. His shins are canting into a run, and with his left arm he’s pushing at the chest of a runner to that side of him. A split second later, his right arm juts up to block more runners.

All around Dold, the racers are wincing, for what’s coming is harsh. There are 1,576 steps ahead of them, 10 to 12 minutes of suffering. And before that, less than 10 yards from the start, there’s a door to get through. It’s standard size, 36 inches wide, and everyone, Dold especially, wants to be the first one there. The jockeying is desperate. In 2009, Suzy Walsham, an Australian, was shoved into the wall next to the door. “The impact was so great,” she says, “that I initially thought I had broken my nose and lost teeth.” She fell and was trampled before she rose and ran on to victory. “I get super nervous and anxious whenever I start” at the Empire State Building, says Walsham, who has won the women’s division three times and will be one of about 650 competitors at this year’s race, which takes place Feb. 6. “I really dread the start.”

What the racers may dread even more, however, is the sight of Thomas Dold dashing up the stairs two at a time, yanking along on the railings. Dold has won Empire State (known as Esbru among the stair-racing community) a record seven consecutive times. He is the only person in the world who makes a living at stair racing (his sponsors include a German health care company), which makes him the lord of an obscure but nonetheless codified sport. According to the World Cup rankings on towerrunning.com, Dold finished 2012 in first place, with 1,158 points, 157 more than the runner-up, Piotr Lobodzinski of Poland. Four hundred of those points came from his victory at Esbru, tower racing’s unofficial world championships, and its oldest contest, dating to 1978. Another 156 stair races, held in 25 nations, generate World Cup points as well.

Dold also sits atop the Vertical World Circuit, a championship tour of eight celebrated races — among them, Esbru — and he is a minor celebrity on YouTube. In one clip, you can see a smiling Dold sprinting stadium steps at a photo shoot for a print ad. In another video, from the Corrida Vertical, a 28-story dash in São Paulo, the announcer cracks, “A shortcut to win the race is break Dold’s legs . . . or giving him some sleeping pills.” Dold wins and, as he crosses the finish line, still running, peels off his plain white race jersey to reveal a sleek undershirt emblazoned with his Web address, run2sky.com.