Stairways to heaven: Meet the Cork-born designer scaling new heights in world's glitziest buildings

The Hyatt Hotel Lobby stairwell in New York, designed by Norman Mooney.

If you've never heard of Norman Mooney, you may well have walked on some of the stairways he has created. 

If you've travelled to New York, Boston or Miami in recent years, chances are good his works of art have contributed to your step count.