He studied at the École des Beaux-Arts de Paris from 1965 to 1972 in the atelier of Gustave Singier.
Since 1979, he has lived and worked in Marcilly-sur-Eure in Normandy, where he founded an educational and social action group to help children with art called Louisiana Source. He has been married with the designer Elisabeth Garouste since 1969. lieutenant was there he discovered Duchamp.
Around this time, he created several works of scenography for his friend, author and director Jean-Michel Ribes, notably for the productions of Il faut que le Sycomore coule and Jacky parady.
In 1977, he presented at the Palace theater Le Classique et l"Indien, a show he wrote, directed, and decorated foreign He would stay with the Palace until 1982 as a scenographer and painter.
In 1980, he had his first art show at the Durand-Dessert gallery, showing figurative, mythological, and allegorical paintings. This show brought him national recognition, and then, international.
His first international show took place in New York in 1982 at the Holly Solomon Gallery.
Others followed, such as those at the Leo Castelli Gallery in New York and in Sperone, Italy. He was the only French artist to be invited to the Zeitgeist at Berlin. Institutional recognition came in 1987, at the CAPC of Bordeaux (Centre d"arts plastiques contemporains de Bordeaux), where he presented a combination of oils on canvas and acrylics on homespun, and then at the Fondation Cartier.
Garouste has executed works and decorations for various endeavors: paintings for the Élysée Palace, sculptures for Évry Cathedral, the ceiling of the theater at Namur, and for the church of Notre-Dame de Talant, stained glass.
In 1989, he did the curtain for the Théâtre du Châtelet. He received an order in 1996 for a monumental work for the National Library of France mixing painting and wrought iron.
Sculpture and engraving were attracting him more and more, as well as illustration for all sorts of writings, from Don Quixote to the Haggadah. In 2001, he presented at the Fondation Cartier Ellipse, an arrangement of canvasses mounted on a construction of his own design.
Since 2001, he has been represented by the Daniel Templon Gallery.
1988: Gérard Garouste at the Musée national d"art moderne in Paris 2001: 2002: Kézive ou la ville mensonge, Daniel Templon Gallery 2003: Saintes ellipses at the Chapelle de la Salpêtrière 2004: Portraits, Galerie Daniel Templon, Paris 2005: Louisiana Coupole at the Panthéon 2006: L"Anesse et la Figue, Daniel Templon Gallery, Paris 2008: Louisiana Bourgogne, la famille et l"eau tiède, Daniel Templon Gallery, Paris 2012: Walpurgisnacht, Daniel Templon Gallery, Paris 2014: Ineffable Tales, Daniel Templon Gallery, Paris.