Barrat began collaborating with the Human Arts Ensemble. Stewart gave the group a building, and they began video workshops for the youth of the neighborhood. Barrat traveled to Harlem to bring children to participate in the music and video workshops, beginning a lifelong dedication to the neighborhood. Around 1971, Barrat started to work with video in the South Bronx with two gangs: the Roman Kings and the Roman Queens, as well as the president of the Ghetto Brothers. She spent all of her time for years working with the members and sharing the video equipment, creating a series of videos between 1971 and 1976. The series, called You Do The Crime, You Do The Time, debuted at Columbia and at the French embassy in a show organized by Félix Guattari and Gilles Deleuze, through their organization CERFI. In 1978, Barrat was awarded the prize of Best Documentary Filmmaker in Milan, Italy for the film. In Italy, Channel 2 aired the film several times at prime time. In America, earlier that same year, excerpts were aired on NBC. The Whitney Museum in New York also showed the film along with Barrat's first photography of the South Bronx, which was well-attended and well-regarded by the press. In the following years, she immersed herself in photographing the boxing world in New York, from young boys training in Harlem, Bed-Stuy, Brooklyn, to the Bronx. The resulting work was displayed at the consulate general of France in New York, with the book titled Do or Die. In 1993, the photographs were collected in the book Do or Die, published by Viking Penguin and prefaced by Gordon Parks and Martin Scorsese: "Patiently, painfully and with a highly discerning heart, Martine Barrat has filled our eyes with a world of young warriors eager to earn the honors of their hostile sport.... A wistful, beauteous demeanor betrays the hardness that is already building in their hearts.... with powerful pictures and strong words, Martine Barrat captures the spirit of young fighters who, with the other guy's blood on their gloves, return joyously to their concerns." In 2007, Barratʼs work was featured in the acclaimed Harlem In My Heart, a major retrospective at La Maison Européenne de la Photographie in Paris. The show featured 190 photographs and her most recent video work and was reviewed and featured in over fifty international newspapers, magazines and radio shows. The French publication Libération remarked that "'Harlem In My Heart' is not a monument to the glory of American blacks, but a collection of moments in their company, a rare intensity...it is almost impossible not to cry, the emotion is palpable." The photos of Harlem in My Heart were titled by David Murray, composer and jazz musician, for the show. Her involvement with the jazz scene in New York City has resulted in textual collaborations with respected figures of the jazz community, such as Ornette Coleman, who has given many titles to her photographs and written companion texts, and who curated a show including her work. Her influences and friends include Elvin Jones, Ed Blackwell, Mongo Santamaria, Don Cherry, creator of the Human Arts Ensemble Charles Bobo Shaw, as well as Joe Bowie, Lester Bowie and other musicians. The scope of her photography is global: it spans from the neighborhood of Goutte-d'Or in Paris, to the Caribbean islands, through Africa, Japan, and Brazil. Nevertheless, the core of her work evokes Harlem, the anchor of her life since her arrival in the United States. Her works in photography and video are conserved in the collections of MoMA, the Museum of the City of New York, the Whitney Museum, the Schomburg Center for Research in Black Culture, the Brooklyn Museum, the Lincoln Center Library, the Bibliothèque Nationale de France, and the Maison Européenne de la Photographie in Paris, as well as in numerous private collections. With Brent Hayes Edwards, author of several books on African-American culture, she is currently developing a book of photography, titled Voices from Another Country: The Lost History of the South Bronx. Expositions of her work in Brazil, Germany, Paris, and New York are forthcoming.