At the age of 16, she left Switzerland to study theatre décor at TNS in Strasbourg.

In 1973, at the age of 17, she was accepted at the National School of Fine Arts in Paris.   Paris became her home, her cultural base and she was happy to have the opportunity to experience the city. It was in Paris that she lived with her first true love, Romain Denis, grandson of Maurice Denis. Romain was also an artist. They inspired each other and her years in Paris were very productive. She painted large expressionist and figurative paintings using Kraft paper as support. She liked the Kraft paper for its colour, its texture and its price.

In 1977 Cathy experienced a crisis with her art: she could no longer paint. She moved to New York where she was alone for the first time. She opened herself to the worlds of theatre and dance and she even studied midwifery.

In 1979 she headed to England where she graduated in Performing Arts at Dartington College of Arts. In England she met some of the most important people in contemporary dance at that time. Two in particular would go on to have a great influence on her work: Steve Paxton who founded the Judson Church of New York in the 1960s and creator of dance form called Contact Improvisation, and Mary Fulkerson one of the founders of Release Work.

During her four years at Dartington College of Arts, Cathy teamed up with fellow student, Mara de Wit. In 1983, for their final exam, they created a choreography called "Fiesta Graduata". They were praised by the jury and one of them later wrote, "The world is your oyster."

After Dartington, Cathy and Mara decided to continue working together. They moved to Wales where they started a dance-theatre company called Research and Navigation. Dance and choreography became an integral part of Cathy's work and painting.

In July 1991, Cathy gave birth to her son, Pierre and in September of the same year, she and her husband decided to divide their life between Paris and Tuscany. Cathy began to dance less and dedicated herself to painting.

Cathy grew more and more settled in Paris. She soon got to know Grati Baroni Piqueras, a painter and great connaisseur in art who took interest in her work and from then on followed and adviced her. Grati introduced Cathy to numerous personalities, one of whom was Marie-Helene Montenay from the Montenay-Giroux gallery where she exhibited Cathy's work on a number of occasions. In 1995, Cathy divorced and settled definitively in Paris.

Cathy was always very close to her grandmother, Hilda Kagan, but in 1997, she died. She lived and worked in the 14th arrondissement with her son Pierre.

In 1999 Francesca Piqueras, Grati Baroni Piqueras's daughter, organised an exhibition for Cathy Josefowitz based on the "Chaises Rouges" series.   She also directed a short film about "Les chaises".

In November 2003, at one of the exhibitions of the "Collages", Grati Baroni Piqueras and her daughter introduced Cathy to filmmaker Francois Levy Kuentz and his scriptwriter brother, Stéphane.   The three of them decided to make a documentary film about the last ten years of Cathy's work in her studio in the 14th arrondissement .

During the summer of 2004, Cathy Josefowitz and her son Pierre moved to Switzerland. Today, she lives and works in Geneva.