French visionary architect, theorist, and teacher.

Boullée wanted originally to be a painter, but, following the wishes of his father, he turned to architecture. He studied with J.-F. Blondel and Germain Boffrand and with J.-L. Legeay and had opened his own studio by the age of 19. He designed several Parisian city mansions in the 1760s and '70s, notably the Hôtel de Brunoy (1774–79). Despite the innovative Neoclassicism of his executed works, Boullée achieved a truly lasting influence as a teacher and theorist. Through his atelier passed such masters as A.-T. Brongniart, J.-F.-T. Chalgrin, J.-N.-L. Durand, A.-F. Peyre, and L.-M. Thibault. In all, he taught for over 50 years.

In his important theoretical designs for public monuments, Boullée sought to inspire lofty sentiments in the viewer by architectural forms suggesting the sublimity, immensity, and awesomeness of the natural world, as well as the divine intelligence underlying its creation. At the same time, he was strongly influenced by the indiscriminate enthusiasm for antiquity, and especially Egyptian monuments, felt by his contemporaries.

The distinguishing aspect of Boullée's mature work is his abstraction of the geometric forms suggested by ancient works into a new concept of monumental building that would possess the calm, ideal beauty of classical architecture while also having considerable expressive power. In his famous essay La Théorie des corps, Boullée investigated the properties of geometric forms and their effect on the senses, attributing “innate” symbolic qualities to the cube, pyramid, cylinder, and sphere, the last regarded as an ideal form. In a series of projects for public monuments, culminating in the design (1784) for an immense sphere that would serve as a cenotaph honouring the British physicist Isaac Newton, Boullée gave imaginary form to his theories. The interior of the cenotaph was to be a hollow globe representing the universe.

To bring geometric forms to life, Boullée depended on striking and original effects of light and shadow. He also emphasized the potential for mystery in building, often burying part of a structure. This “poetic” approach to architecture, in some ways prefiguring the 19th-century Romantic movement, may also be seen in Boullée's extensive use of symbolism. For example, his Palais Municipal rests on four pedestal-like guardhouses, demonstrating that society is supported by law.

Boullée's emphasis on the psychology of the viewer is a principal theme of his Architecture, essai sur l'art, not published until the 20th century. He has been criticized as a megalomaniac, because of his tendency toward grandiose proposals, but these should be regarded simply as visionary schemes rather than as practical projects. In his desire to create a unique, original architecture appropriate to an ideal new social order, Boullée anticipated similar concerns in 20th-century architecture.