Conversation so far:
What was the revelation that shaped Lee Strasberg's life?
H]e observed, first of all, that all the actors, whether they were playing leads or small parts, worked with the same commitment and intensity.
Where did he observe the actors?
when Stanislavski brought his Moscow Art Theatre to the United States in 1923.
What was unique about these actors?
More important, every actor seemed to project some sort of unspoken, yet palpable, inner life for his or her character.
Did he learn anything from their acting style?
he could be mentally prepared by resort to analogous mental exercises.
They worked on relaxation as well as concentration.

Question: What did he do after this following with the Art Theater?
Self-contained rewrite: What did Lee Strasberg do after following the Art Theater in the United States in 1923?