These adjoining buildings used to be the William H Chandler Chemistry Building (1883) and the Harry M. Ullmann Chemistry Laboratory (1938). William Chandler was appointed as professor of chemistry in 1871 and retired in 1905; during this time he guided the department and gained a national reputation for his work. The building was home to the Department of Chemistry until it moved into the new Seeley G. Mudd Building in 1976; it is now the Department of Art, Architecture and Design and the Department of Psychology are located in Chandler-Ullmann. The structure is considered by some architectural historians to be the first "modern" laboratory because of its system of ventilation and the design of its laboratories. The building, which won a prize for design at the Paris Exposition of 1889, was designated a National Historic Chemical Landmark by the American Chemical Society in 1994.