Conversation so far:
What did Grace Hopper do after she retired?
Following her retirement from the Navy, Grace Hopper was hired as a senior consultant to Digital Equipment Corporation.
What did Grace Hopper do as a senior consultant?
Grace Hopper was a goodwill ambassador.
Did Grace Hopper give speeches?
Grace Hopper lectured widely about the early days of computing, her career, and on efforts that computer vendors could take to make life easier for their users.

Question: What was her biggest contribution post-retirement?
Self-contained rewrite: What was Grace Hopper's biggest contribution post-retirement?