Career
Memhardt emigrated from Linz to the Netherlands in 1622, where he probably learned the art of fortification. He served as a military engineer with George William, Elector of Brandenburg from 1638 onwards and in 1641 was appointed court engineer Under his leadership the Residenzschloss was repaired and a chapel built for crown princess Louise Henriette.
In the Lustgarten he built a "Lusthaus".
From 1651 the Schloss Oranienburg and its gardens were built to Memhardt"s designs, known from the plan of Berlin published in 1652.