Career
Among his most celebrated decorations are those at Schönhausen Palace, Germany, and Rundāle Palace, Latvia. Johann Michael Graff came from a family of stucco decorators from Bavaria. Johann Michael Graff however seems to have moved to Brandenburg at some point and was influenced by the decorative style predominant in and around Berlin at the time.
He very probably made decorations for Schönhausen Palace before being hired by the Duke of Courland, Peter von Biron, to decorate his residences in present-day Latvia.
He is known to have decorated Jelgava Palace (decorations destroyed during World World War II) and Rundāle Palace for the Duke. He also made lavish stucco decorations for Põltsamaa Castle (destroyed during World World War II) in present-day Estonia, as well as (possibly) in Kabala Manor in the same country.