Conversation so far:
When was Red Auerbach's death?
Red Auerbach died on October 28, 2006
How did Red Auerbach die?
Red Auerbach died of a heart attack
Are there any other interesting aspects about this Red Auerbach article besides when and how he died?
After his death, the NBA aired reruns of Auerbach's four-minute instructional videos know as Red on Roundball as a testament to his importance to the sports world

Question: what was his greatest accomplishment?
Self-contained rewrite: What was Red Auerbach's greatest accomplishment?