John Adalbert Madigan, (12 August 1850 - 23 August 1897) was an American circus performer and ringmaster, during the later years of his life he worked in Scandinavia.
 He was raised in an American circus family of Irish background.
 He is known for his work in U.S circus scenes between 1866 and 1869, but from 1872 he worked at Cirkus Myers in Central Europe.
 To this circus, the Swedish-Norwegian circus artist Eleonora Olsen, later known as Laura Madigan (mother of Elvira Madigan) came to work in 1875, the two became a couple.
Christa Hughes is an Australian singer, circus performer and comedian.
 She utilises wild on-stage antics and a powerful voice.
 From age 15, she has done gigs with her father, jazz pianist and journalist, Dick Hughes.
 At age 17 had a regular set at Sydney's Shakespeare Hotel.
 She was the vocalist for the band Machine Gun Fellatio (as KK Juggy) from 2000 to 2005.
 Alongside her solo career, Hughes was also the Ring Mistress with Circus Oz (2006–08) and has issued an album, "21st Century Blues" (2010) with her father.
Victor Adolphus Pépin (March 8, 1780 – 1845) was an American circus performer and circus owner most famous for being a partner in the Circus of Pépin and Breschard.
 The Circus of Pépin and Breschard can thus be considered the first American circus and Pépin the first American circus impresario.
Mighty Haag Circus was started by Ernest Haag (17 June 1866 - 1 Feb. 1935) in Shreveport, Louisiana.
 His circus toured continuously for over 40 years, from 1891 to 1935.
 Ernest Haag Circus toured using a boat, carts, trains, horse pulled wagons and trucks.
 At the time it was one of the largest traveling Circus in the United States.
 Many of Haag performers went on to have very successful careers after working in Haag Circus.
 Harry James (1916–1983) grew up in the Mighty Haag Circus as his father, Everett Robert James, was the bandleader in Mighty Haag Circus.
 Harry James' mother, Myrtle Maybelle (Stewart), was an acrobat and horseback rider in the Circus.
 Maybelle and Everett liked Ernest Haag so much they gave their son his middle name, Harry Haag James.
 Harry James was born in Albany, Georgia while the Haag Circus was performing there.
 The James family departed the Circus in 1931 when Harry was 15.
 Laurence Brasfield of Uncle Cyp and Aunt Sap Brasfield start in the Haag Circus at age 14.
 Cornet player Don Essig played in Haag Circus.
 Starting as Haag performers Rube Walters and Heinie Emgard became a vaudeville act.
 Fisher's Performing Elephants continued tours after the Haag Circus ended.
 Ruby Haag Brown performed for 50 years in the Haag Circus, the Ringling Bros. and Barnum & Bailey Circus, the Circus Hall of Fame and Shrine Circus.
Dolly Jacobs (born c. 1957 in Sarasota, Florida) is an American circus aerialist.
 She is the daughter of famed circus clown Lou Jacobs and former New York fashion model turned circus performer Jean Rockwell Jacobs.
 She began her circus career in 1975 and has been working ever since.
 She was a featured performer with Ringling Brothers and Barnum and Bailey Circus.
 She and her husband, fellow circus performer Pedro Reis, founded Circus Sarasota in 1997.
 In 2012, she received the Florida Folk Heritage Award, and in 2015, was awarded a National Heritage Fellowship award by the National Endowment for the Arts.
Mathieu Laplante is a producer, director, choreographer, and former circus performer.
 He was a world-renowned gymnast from the age of 8 through 15 before joining Cirque du Soleil .
 He has worked on stage with artists such as Michael Jackson, Peter Gabriel, and Janet Jackson.
 He is best known for his work with Cirque-style shows.
 He began performing with Cirque du Soleil at the age of 16 and directed his first Cirque-style show at the age of 26.
Arne Arnardo (12 October 1912 – 4 May 1995), born Arne Otto Lorang Andersen, was a Norwegian circus performer and -owner, generally referred to as the "circus king" of Norway.
 He escaped with the circus at an early age, took the stage name "Arnardo", and developed proficiency in several different acts.
 In 1949, he opened his own circus, under the name of Cirkus Arnardo.
Dio Kobayashi (小林睦史 , Kobayashi Atsushi , born August 28, 1972) is a Japanese circus performer.
 He is the first Japanese circus performer to become a member of the World of Top Entertainer tour.
 He currently works as a worldwide circus performer.
 His other stage names include "Kinosuke Otowa" and "Clown Joker".
Gisela Antonia Brož (Brosch) (also sometimes referred to as Gisela Madigan), (4 April 1865 - 1945) was an Austrian-American circus performer, tight rope dancer, and clown.
 Her parents were shoemaker Joseph Brož and his wife Maria.
 She went to convent school in Siebenbürgen and at the age of 15 she got to know the circus family Madigans with John and Laura who at that time toured with circus Krembser in Vienna.
 Gisela became their foster child and got to learn tight rope dancing, this along with the couple's two year younger daughter Elvira Madigan.
Josh Routh is a nationally recognized American circus performer, and a founding member of the comedic troop Brothers Kaputnik, Death By Tickle and Circus Kaput.
 Josh trained at the Circus Center in San Francisco, California and attended the Clown Conservatory where he graduated "Class Clown".
 The Conservatory is where Josh found his alter ego "Tchotchke Kaputnik".
 As Tchotchke, Josh has performed with The New Pickle Circus (formerly the Pickle Family Circus, The San Francisco Youth Circus, The Much Ado Shakespeare Circus and Velocity Circus.

Question: At age 15, Gisela Brož got to know a circus performer of what nationality?
Answer: American