The comma is used incorrectly in this sentence because it attempts to separate a compound subject.
A compound subject occurs in a sentence when a sentence has two or more subjects. In this case, the compound subject is The Poet Laucreate Consultant and the Librarian of Congress.
To avoid confusion, a predicate is the part that modifies the subject in some way. In this case the predicate is prepared. It is not a compound predicate, nor does the comma separate it from anything.