Conversation so far:
What is the first production Edwin Booth was in?
Edwin Booth performed alongside his father, making his stage debut as Tressel or Tressil in Colley Cibber's version of Richard III
What is Edwin Booth's most famous production?
Some theatrical historians consider Edwin Booth the greatest American actor, and the greatest Prince Hamlet, of the 19th century.

Question: What was his accomplishment at the peak of his career?
Self-contained rewrite: What was Edwin Booth's accomplishment at the peak of his career?