Nope, he is an idiot for not making sure that all of his biographies post that he is a constitutional lawyer.
Constitutional lawyer who apparently never followed that profession, perhaps. I do not find one source saying that he worked for many years as one, not even one. Do you have any source saying it? :
[ Not during Reagan]
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The Office of the Chief of Staff is responsible for directing, managing and overseeing all policy development, daily operations, and staff activities for the President. This office coordinates and communicates with all departments and agencies of the Administration.