Not many people would see quadriplegia as a gift. But then, not many people are Paul Callahan.

As a 21-year-old Harvard University student, Paul's life was full of possibility. An undergraduate studying business at one of the best universities in the world, there was a lot to look forward to for the young man from Massachusetts.

Then a freak accident changed everything. Paul slipped on a wet floor, breaking his neck and rendering him paralyzed from the chest down. He retained the use of his arms, but not his hands.

Callahan spent the next five years traveling to rehabilitation centers across the United States in search of a way to walk again. When a doctor finally suggested it was time to concentrate on living instead of walking, Paul did exactly that.

Almost 30 years later, the 55-year-old father of two is now set to represent the United States in sailing at the Paralympics.

"It's an evolutionary process where you transition from one life to the other," Paul told CNN.

"I never gave up moving forward. You can define that as walking or being a contributing member of society. At 26 I chose the later."

Golden hopes

Next week Paul and his two team mates -- both amputees -- will take to a 24-foot boat for the three-person sailing event at the Paralympics.

Skipper Paul drives the boat by wearing rollerblading gloves on his hands, attached to bicycle pedals. The pedals are in turn linked to a pulley system that steers the vessel.

This will be Paul's second Paralympics, after his debut at Sydney in 2000. The U.S. team failed to win a medal, but as Paul admits he was still fresh to the sport.

With a fifth place in the Disabled Sailing World Championships in Weymouth last year, this time gold is on the cards, he insists.

It would be an incredible achievement in a life already marked by success. Paul returned to Harvard in 1983, becoming the first quadriplegic to graduate from the university.

He then went on to work at Goldman Sachs as an asset manager for 15 years.

"Everyone is quite capable of doing much more than they think they can," Paul said.

"Once they realize that fact, then the world becomes their oyster."

Sail to Prevail

It was a chance sailing trip in 1995 that sparked Paul's love for the sport -- and a new venture that would help thousands of disabled children.

"I got on a sailboat and looked back at my empty wheelchair on the dock," Paul said.

"It was the first time in 15 years I was able to do something on my own. It was an incredible moment."