Architect, John Carl Warnecke and Associates, New York, NY; while working in the Warnecke office, Sayer worked as an architect on the Nimitz Library at the U.S. Naval Academy, Annapolis, MD. Partner, Maher and [Peter D.] Sayer, Interior Architecture and Design, New York, NY, 1980- ;

Architect Sayer had 38-year relationship with the interior designer William Eugene Mayer (1935-2010), who was also his business partner since 1980. The two met each other while both worked in the NY office of the CA architect John Carl Warnecke (1919-2010).