Too easy, Ted Cruz.
Az Solicitor General of Texas, Ted Cruz presented oral argument for the 31 amici states in the COMPANION case to Heller before the United States Court of Appeals for the District of Columbia Circuit.
Heller had a personal team of six lawyers working directly for him on his case. They were secured by this Second Amendment Foundation. Their fees were eventually paid by the Defendant City because the Court allowed it on this kind of case. Alan Gura actually argued the case in SCOTUS.