A principal of the firm, Dan is an architect and urban designer whose 35-year career combines achievements in professional practice with academic pursuits of teaching and writing. He is the founder of Solomon E.T.C., now a WRT company, and the principal author of its many award-winning projects. Residential architecture and the interaction between housing and urban design have been the main focus of his work. He is a co-founder of the Congress for the New Urbanism and author of many articles and two books: ReBuilding (Princeton Architectural Press, 1992) and Global City Blues (Island Press, 2003).

In 2004, Dan won the Maybeck Award, the AIA California Chapter's honor for lifetime achievement by an individual architect for producing consistently distinguished design.