As a child, Alain-Charles Beau was "sensitized" to the image and to the gaze by the photographic works of his father, André Beau. After studying film editing, he made his military service at the Établissement Cinématographique et Photographique des Armées. In 1973, he deepened his practice of photography during the shooting of a film documentary in Java, Indonesia, on which he was the assistant director. His photographs of the temple of Borobudur will be published in Borobudur by Jacques Dumarcay.
From 1977, he became chief editor of large reports and documentaries for television. He collaborates mainly in the productions of the French Image Agency directed by Roger Stephane.
From 1980, Alain-Charles Beau became also author-photographer. In 1982, he exhibited his first work, Les Éclaireurs, a series in black and white, in a universe close to the book His Majesty of the Flies by William Golding, at the Galerie Régine Lussan, Paris. The same year, he became a made to order film director. About 350 films will be made in all areas except fiction: Luxury, History, Museums, Arts.
Several photography exhibitions follow: Les Mythes de nos nippes, in 1983, series in black and white on the work of a children's workshop dedicated to the creation of clothes at the Musée d’Art Moderne in Paris. Series archived in the Collections of Paris Museums. A Jewish wedding, in 1987, first photo prize of the International Competition by the Museum of Jewish Diaspora, Tel Aviv. Suerte, in 1997, black and white series on the novilleros, exhibited in Saint-Rémy-de-Provence.
From 1995, Alain-Charles Beau devoted himself to a work on fashion designer Christian Lacroix. Six years with the stylist allow him to archive nearly 10,000 images on the Maison de Couture. At the same time, he photographs the work stylists Jacky Rzenno and Marc Schils from the Shirtology brand from 1998 to 2002. In 1998, a series of photographs in black and white is presented in the exhibition Histoire d’une création de haute couture de Christian Lacroix, on the initiative of the Ministry of Culture and of the Visual Arts delegation. This series is acquired by the National Fund for Contemporary Art. In 2008, at the invitation of Christian Lacroix, Alain-Charles Beau takes part in the Rencontres d’Arles de la Photographie with the exhibition Avec Christian Lacroix. 1995-2000.