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You are almost certainly more experienced than ESR. He held his last technology position in the early 1990s.

Then again, ESR has assumed a role in the free software community as a VCS expert, as evidenced by his reposurgeon project and uses.

Providing an excellent example of what your schoolteacher said about "assuming".

And his recent months of work on migrating Emacs from bzr to git.

During which it became abundantly clear that he is surely no git expert (which does not diminish the work he did).