Sulan Kolatan & William J. MacDonald founded their New York City based architecture and design firm KOL/MAC in 1988. The firm is widely acknowledged as a leader in architecture and design for its innovative digital approach. Their current work is focused on linking unique digital design methods to new methods of construction, new technologies of production and new generation of materials.

They have collaborated with a number of other engineering firms, such as the British engineering firm Arup AGU London, the US landscaping firm Hargreaves Associates, the French lighting and scenography firm Duckscéno and the Canadian real-time artificial intelligence software firm Biographic Technologies,Inc. among many others. Recent projects include the competition for the redevelopment of the Carlsberg brewery site in Copenhagen, Denmark, the competition for the FRAC Museum for Contemporary Art and Architecture in Orléans, France and the design and development of a high-performance ecological skin for high rise buildings sponsored by DuPont Corian. The firm has participated in a number of exhibitions worldwide, including the Museum of Modern Art New York's exhibition "The Un-Private House". Other KOL/MAC work has been exhibited there since, with the most recent project being INVERSAbrane-an Invertible Ecological Building Membrane featured in "SAFE-design takes on risk".

Their work is in the permanent collection of the San Francisco Museum of Modern Art.