Question: What is the nationality of the most successful wingsuit flyer?

Context paragraphs:
Steph Davis: Stephanie "Steph" Davis (born 1973) is an American rock climber, BASE jumper, and wingsuit flyer.  She is one of the world's leading female climbers, having completed some of the hardest routes in the world.  She is the first woman to have Soloed a 5.11 grade climb, the first woman to summit all the peaks of the Fitzroy Range in Patagonia, the second woman to free climb El Capitan in a day, the first woman to free climb the "Salathė Wall" on El Capitan, the first woman to free solo The Diamond on Longs Peak in Colorado, and the first woman to summit Torre Egger.  Davis has been married twice, first to Dean Potter, ending in divorce; then to Mario Richard.  Both Potter and Richard died in wingsuit accidents.

The Wild Flower and the Rose: The Wild Flower and the Rose is a 1910 American silent short drama produced by the Thanhouser Company.  The film focuses on Frank Wilson, the son of an inventor who has constructed a new airplane model.  After failing to secure financing, his father suggests that he marry Rose, the daughter of his wealthy employer, to get the money they need.  Jack rejects this idea because he is engaged to another woman, but he soon learns she does not love him.  He heads out West to seek a fortune and is quickly successful.  He returns to the aviation field and meets Rose again, after a successful flight she confesses to loving him.  The cast and staff credits are unknown, but the film may have included scenes from the 1910 International Aviation Meet at Belmont Park.  One reviewer claimed that a Wright brothers flyer was also shown in full flight.  The film was released on November 25, 1910, but is now presumed lost.

Jeff Provenzano: Jeff "Jeffro" Provenzano (born September 12, 1976) is an American professional skydiver, wingsuit flyer, BASE jumper, HALO jumper and stuntman.  He is a member of the Red Bull Air Force, and is considered to be a pioneer of the skydiving discipline of swooping.

Attention – A Life in Extremes: Attention – A Life in Extremes is a 90-minute documentary film, which explores the phenomenon of extreme sports from a personal and critical perspective.  The documentary shows the lives of three athletes: French freediver and world champion Guillaume Néry, Austrian extreme cyclist Gerhard Gulewicz and Norwegian wingsuit flyer Halvor Angvik.

Yves Rossy: Yves Rossy (born 27 August 1959) is a Swiss military-trained pilot and an aviation enthusiast.  He is known as the inventor of a series of experimental individual jet packs, the latest using carbon-fiber wings for flight.  Often referred to as "Jetman", Rossy has sometimes tested and presented new versions of his jet packs in high-profile events staged around the world.

Wright Flyer: The Wright Flyer (often retrospectively referred to as Flyer I or 1903 Flyer) was the first successful heavier-than-air powered aircraft.  It was designed and built by the Wright brothers.  They flew it four times on December 17, 1903, near Kill Devil Hills, about four miles south of Kitty Hawk, North Carolina, US.  Today, the airplane is exhibited in the National Air and Space Museum in Washington D.C. The U.S. Smithsonian Institution describes the aircraft as "the first powered, heavier-than-air machine to achieve controlled, sustained flight with a pilot aboard".  The flight of "Flyer I" marks the beginning of the "pioneer era" of aviation.

Joby Ogwyn: Joby Ogwyn ( ) (born August 25, 1974) is an American mountain climber, BASE jumper and Wingsuit flyer.

Boulton Paul Phoenix: The Boulton and Paul P.41 Phoenix, a single-engined two seat parasol monoplane was aimed at the amateur private flyer which costs less than the successful de Havilland Moth.  Despite positive responses from its target purchasers, no orders were forthcoming and only one was built.

Roberta Mancino: Roberta Mancino is an Italian skydiver, BASE jumper, wingsuit flyer and international model.  She has participated in more than 7,000 skydives and won several awards and world records.  She has gone on four skydives while completely naked, and on five occasions her parachute did not open in mid-jump.  In 2010, Mancino was named the World's Sexiest Female Athlete by the magazine "Men's Fitness".

Powered skydiving: Powered skydiving is an activity where a skydiver jumps from some height (usually an airplane) wearing propulson and small wings to fly their bodies.  Efforts have been made by wingsuit flyers to sustain altitude, but the most successful was Yves Rossy who jumped out of an airplane wearing airplane-type rigid wings with four small jet motors attached to them.

Supporting paragraphs: Powered skydiving Yves Rossy
Answer: Swiss