Structural engineer, Ysrael Seinuk, is Mr New York.

You can't walk down the streets of Manhattan without seeing a building that famed structural engineer Ysrael Seinuk hasn't touched.

He and the firm he heads, Cantor Seinuk, has engineered over 50 high-rise office buildings, numerous major hotels and hundreds of apartment structures within New York alone.

Among the firms most notable New York projects are the Trump World Tower; the Trump International Hotel and Tower; the new 42nd Street Redevelopment project at Times Square; the new Riverside South apartments; the New York Mercantile Exchange; Four Times Square; the "Lipstick" Building; Trump Tower on Fifth Avenue; the award winning Arthur Ashe Tennis Stadium in Flushing Meadows; Morgan Bank Headquarters; 7 World Trade Center; The Galleria; the landmark 450 Lexington Avenue; the Grand Hyatt; Crowne Plaza; and Marriott hotels.

"Ysrael Seinuk and his staff are the best in the business." Trump said recently. "They give me the expertise I need to build quality buildings. Time and time again, the Cantor Seinuk team has implemented engineering solutions no one else considered."

Worldwide, Cantor Seinuk has completed billions of dollars worth of construction in the United States, Latin America, Europe, the Philippines, South America, the Middle East, and the Far East.

To Seinuk, who graduated from the University of Havana in 1954 and joined Cantor Seinuk as a partner in 1970, each building is unique.

"Every building has a structure that is the best structure for that building," he said. "You have to be able to drink about it and talk about it."

He describes buildings as if they were living organisms.

"You have to be able to see the building in your head to see how she is going to react, to see how she is going to move," he said. "First you have to see the building inside you. You have to feel it."

His latest achievement is the Chapultepec Tower, a 57-story, 1,600,000 square foot, 750-feet high office building located in the most severe seismic zone of Mexico City.

Seinuk's life-saving design has already been patented.

"The building already went through an earthquake," said Seinuk. "A newspaper in Mexico said you might want to run into this building during an earthquake."

The structure's lateral system consists of steel perimeter tubes and interior eccentric braced core. A Viscoelastic supplemental damping system was added to the lateral system in order to enhance the seismic resistance of the building. The dampers minimized the construction cost and reduced the seismic impact on the building and its contents.

As far as the most challenging, he said each project is distinctive and can stand on its own merits.

"Projects are like children," he said reflectively, as photos of his children and grandchildren sit behind him on his credenza.

Some are very talkative, some are very smart, some are very playful. They all have different characteristics. If you have five children, you don't have one you like best over the other ones."

Considered a genius in the structural engineering field, Seinuk passes on some of his knowledge at Cooper Union School of Architecture, where he teaches structures in architecture.

"Ysrael, who has taught at the Irwin S. Chanin School of Architecture for 35 years, is an extraordinary teacher inspiring Cooper Union students to understand the forces of earth and wind that effect and shape the buildings we inhabit," said Elizabeth O'Donnell, associate dean at the school of architecture.

"He was my teacher when I studied architecture, and I continue to learn from him today. By his incredible intellect, his great spirit and his remarkable work, his effect on architecture, and architectural education, will continue for generations."

But probably the most impressive quality about Seinuk, despite all the accolades and hundreds of design awards, is that he remains quite humble, making sure his staff gets credit.

"I'm not alone," he said. "We have quite an organization. You get information from everyone in our organization."

Seinuk is grateful for a fulfilling career. "It's a very interesting business," he said. "It's very rewarding to be able to see what you've done. You walk down the streets of the city and you can see what you have produced and that makes it very rewarding."

But one can be sure Seinuk, who runs five miles every morning, never rests on his laurels.

"Every day I'm starting new, starting news things, opening new markets," he said.