Mark Shearman has achieved extraordinary success as a sports photographer, specializing in track and field. He has a remarkable portfolio — containing images of Olympic legends such as Edwin Moses and Carl Lewis, Usain Bolt and Sebastian Coe — that few can ever hope of compiling. But, he admits without hesitation, he's as hungry as ever to remain at the top of his game.

He's traveled to more than 80 countries. He's had, by his own estimate, more than 1,000 cover photographs for the London-based Athletics Weekly magazine. And he's adapted to the changing technology to remain one of the best in the business.

"Since 2001," he recently told The Japan Times, "I have shot exclusively digital and cannot ever envisage ever shooting in film again."