According to the Internet source given below, Nikolaus Selnecker (or Selneccer) was a German musician, theologian and Protestant reformer born in Hersbruck in Bavaria.
He studied under Melanchthon at the University of Wittenberg and is now known mainly as a writer of hymns such as the much sung Nun läßt uns dem Herren Dank sagen.

Websites:
	Nikolaus Selnecker	Biography by wikipedia.org.