I'm having trouble determining which is the correct punctuation of the sentence: The Dutch master Rembrandt is famous for his self-portrait. I think a comma should be after master and Rembrandt like this- The Dutch master, Rembrandt, is famous for his self-portrait.Is this right or wrong?

Answer 1

No commas needed.
http://owl.english.purdue.edu/owl/resource/596/1/

If you turned the words around, though, you'd need commas:
Rembrandt, the Dutch master, is famous...