From 1770, Strahan was Printer to the King. Strahan was also the printer for the successful London bookseller Andrew Millar, as well as his longtime friend and business partner. Between 1740 and 1765 Strahan moved his London premises four times in the area between St Bride's and the Strand.
From 1770, Strahan was responsible for printing King's documents. He also worked as a printer for Andrew Millar, a successful London bookseller and his long-time business partner. Between 1740 and 1765, Strahan moved his London office four times in the area between St Bride's and the Strand.