The principal designer is 1982 Pritzker Prize laureate Kevin Roche, with John Dinkeloo — a graduate of the University of Michigan — as the expert in construction and technology.Roche and Dinkeloo both previously worked with Eero Saarinen. Almost all buildings built by Roche are with this firm, and they exhibit his particular architecture and aesthetic, although it has changed wildly throughout the past 40 years. Earlier buildings were characterized by massive façades and experimentation with exposed steel and concrete, while more recent buildings emphasize a clean, glassy look suggesting futuristic and green architecture. The firm also built in postmodern and historicist styles during the early 1990s.
The original partnership ended on Dinkeloo's death in 1981, however Roche maintained the firm's name with other principals.