Oliver Sacks and spoken communication

I have been an intellectual admirer of Dr. Oliver Sacks for years. As a writer we can compare him to Dr. Sigmund Freud, another great scientific communicator.
But. alas, no one is perfect and Oliver Sacks did not have a good command of the spoken word. We can listen to him on the web, YouTube for example, delivering lectures, and watch him hesitate, repeat himself, grope for words, in his weird and very personal accent, probably a mixture of Jewish, British and American styles. He is often painful to listen to because we fear he is going to forget where he is, or loose track of what he is talking about, which creates stress in the audience.
And yet, Oliver Sacks was a great communicator and wonderful writer who had plenty to say to his readers. As a public speaker he fell short of expectations.
Oliver Sacks was a native speaker of English but he had not been given the gift of oratory. Writing is one skill, and eloquence in speaking quite another and many do not possess both. I, for one, do not possess either.
So do not feel bad if you find it hard to speak English in public. Or Spanish for that matter.