question: Who was the dancer at the highest rank at the National Ballet of Canada and American Ballet Theatre?
answer: Martine van Hamel
context: Title: Studio Maestro
  Passage: Studio Maestro is a ballet school in New York City founded in 1995 by Rose Caiola.  A portion of its students have graduated into ballet companies including American Ballet Theatre, New York City Ballet, Washington Ballet, National Ballet of Croatia, Pennsylvania Ballet, National Ballet of Canada, San Francisco Ballet, Ballet de Espana.
  Title: Jacqueline Kennedy Onassis School (ballet)
  Passage: The Jacqueline Kennedy Onassis School at American Ballet Theatre (ABT/JKO School) is the associate school of American Ballet Theatre located within the Flatiron District of Manhattan, New York City.  The school comprises a "Children's Division" for ages 4–12, a "Pre-Professional Division" for ages 12–18, and the preparatory program "Studio Company" for ages 16–20.  It was established in 2004 and named in honor of the late, previous First Lady of the United States, Jacqueline Kennedy Onassis, who served on ABT's Board of Trustees as "Honorary Chairman Emerita" for many years prior to her death.  Besides its parent company, graduates of JKO have found employment in various companies, such as National Ballet of Canada, The Royal Ballet, Joffrey Ballet and Dutch National Ballet.
  Title: Martine van Hamel
  Passage: Martine van Hamel (born 16 November 1945) is a Dutch choreographer, director, teacher, retired ballerina and former Principal dancer at the National Ballet of Canada and American Ballet Theatre (ABT).  She was a gold medalist at the biennial Varna International Ballet Competition, the most prestigious ballet competition in the world, held in Varna, Bulgaria.  She is also a recipient of the Prix de Varna, a recognition rarely awarded, for best artistic interpretation in all categories.  As a dancer, she was one of the leading classical ballerinas in America.
  Title: Holly Hynes
  Passage: Holly Hynes is an accomplished costume designer with over 250 ballets to her credit, including more than 70 at the New York City Ballet.  Ms. Hynes' designs are also on view in companies around the world, including American Ballet Theatre, San Francisco Ballet, Bolshoi Ballet, National Ballet of Canada, Kirov Ballet, Royal Ballet, Paris Opera Ballet, Royal Danish Ballet, La Scala Theatre Ballet, Koninklijk Ballet van Vlaanderen, Houston Ballet, BalletMet, Pennsylvania Ballet, Ballet Vancouver, Les Grands Ballets Canadiens, American Repertory Ballet, Pacific Northwest Ballet, Atlanta Ballet, Richmond Ballet, Nashville Ballet, Miami City Ballet, Alberta Ballet, Joffrey Ballet, Kansas City Ballet , and the Suzanne Farrell Ballet at The John F. Kennedy Center for the Performing Arts, where she serves as the resident costume designer.
  Title: Patrick Bissell
  Passage: Walter Patrick Bissell (December 1, 1957 – December 29, 1987) was an American danseur.  He was a leading principal dancer with the American Ballet Theatre.  On his death at age 30 from a drug overdose, he was described by the artistic director of the American Ballet Theatre Mikhail Baryshnikov as "without a doubt one of the brightest lights in American Ballet Theater's history, or, for that matter, in the entire ballet world".  Bissell was noted for his height and athleticism.  His most famous rôle was as Solor in "La Bayadère".  His death prompted investigations into the alleged widespread drug use within the American Ballet Theatre.
  Title: Principal dancer
  Passage: A principal dancer (often shortened to principal) is a dancer at the highest rank within a professional dance company, particularly a ballet company.
citations: Principal dancer Martine van Hamel