Steven Hawking.
Miers does not suffer his impediment.
I had addressed my comment to AmericaUnited who stated that, "I know people who are absolutely brilliant thinkers and yet can't write." He/she seemed to iniducate some personal knowledge.
I gather you have never read anything by Steven Hawking. He is a brilliant writer who is able to provide lucid discussions of complex topics written for a general audience. Hawking is both a brilliant thinker and writer. Miers doesn't deserve to be mentioned in the same breath as Hawking either as a thinker or writer.