"I would say the only thing I fear is God," said the 34-year-old Wallenda.
He certainly had no fear of walking across Niagara Falls on a tightrope, riding a bike on a high wire 260 feet above the ground or hanging from a hovering helicopter by his teeth.
On Sunday, Wallenda will attempt an even more ambitious feat, even for a man who was born into a family of risk-takers.
He will attempt to walk on a tightrope stretched across the Little Colorado River Gorge near the Grand Canyon. The event, which will be broadcast on live television at 8 p.m. EST with a 10 second delay, will take place on the Navajo reservation near Cameron, outside the boundaries of Grand Canyon National Park.