Simon Leventhal has been a dentist in New Jersey for 30 years. He is also an accomplished amateur photographer who has travelled the world - from Africa to the Galapagos - taking photographs of nature and animals in the wild.
His favourite photographic subject, however, was a little closer to home. Some would call it a passion, others an obsession, but Simon spent 30 years capturing more than 50,000 images of the World Trade Center.
"Critics saw 'ugly' in the architecture of the Towers," he explains. "Academically they may have been right, but emotionally they were all wrong. On a rainy day the Towers could be dull; when the light was right they were magic."
The last image he took of the buildings was two days before they were brought down.
Now this enormous collection of beautiful images - taken at all hours of the day, in every season and all types of conditions - is a unique and valuable archive.
"I never intended for the collection to be presented to an audience," Simon explains. "However since the demise of the Towers, I am happy to share them so that people will not forget how iconic they were as the visual anchor of the scene."
Twin Towers: The View from New Jersey tells the love story between one New Jersey dentist and the World Trade Center.