There his uncle, councilor Plattner, introduced him to the duke Wilhelm IV of Saxe-Weimar, who appointed him Kanzleiregistrator and in 1652 librarian.
He received the nickname der Sprossende (the sprouting) and the motto Nützlich und ergetzlich (useful and delightful), as well as the emblem Schwarzbraune gefüllte Nelken (dark-brown carnation).
His famous hymn Wer nur den lieben Gott läßt walten appeared in 1641.
The Pegnesische Blumenorden (a poet's society in Nürnberg named after the river Pegnitz) accepted Neumark as a member in 1679.
He carried on an extensive but not untroubled correspondence with the society's president, Sigmund von Birken, who acted as his literary agent.