He began his career as a documentary film maker, directing ten profiles of unusual artists through the early 1990s with the theme "Magicians of the Earth," commissioned by the Centre Georges Pompidou.
In 2008, the Sonnabend Gallery of New York featured a film installation called The Butcher's Shop, commissioned by the Kimbell Art Museum, in which Haas recreated the space depicted in Annibale Carracci’s 1582 painting of the same name.
Haas's monumental fiberglass sculpture Winter (after Arcimboldo) was unveiled in the National Gallery of Art in Washington, D.C., in September, 2010, before traveling in 2011 to the Piazza del Duomo in Milan and the Garden of Versailles.
In 2012, in a spectacular transformation that is typical of his work, Haas created a group of large-scale, fifteen-foot-high, fibre-glass sculptures, inspired by Giuseppe Arcimboldo's Renaissance paintings of the four seasons, comprising Spring, Summer, Autumn, and including Winter.
The colossal size of Haas's sculpture accentuates the visual puzzle of natural forms—flowers, ivy, moss, fungi, vegetables, fruit, trees, bark, branches, twigs, leaves—as they are recycled to form four human portraits, each representing an individual season.