Conversation so far:
Who did Murray Rothbard marry?
Murray Rothbard married JoAnn Schumacher
When did Murray Rothbard marry JoAnn Schumacher?
Murray Rothbard married JoAnn Schumacher In 1953
Why did Murray Rothbard call JoAnn Schumacher Joey?
Who was  JoAnn Schumacher?
JoAnn Beatrice Schumacher Rothbard, or Joey, was Murray Rothbard's wife. She served as Rothbard's editor and closest advisor and wrote an essay, My View of Murray Rothbard.“
Did Murray Rothbard and JoAnn Schumacher have a good marriage?
Murray Rothbard and JoAnn Schumacher enjoyed a loving marriage and Rothbard often called her the indispensable framework behind his life and achievements.
Where was Murray Rothbard employed?
Murray Rothbard worked from home as a freelance theorist and pundit.
What organization did Murray Rothbard work for?
Murray Rothbard worked with the Volker Fund

Question: How long did he stay there?
Self-contained rewrite: How long did Murray Rothbard stay with the Volker Fund?