– January 7, 1960
–  2008 appeared before the U.S. Supreme Court .presenting the oral argument in District of Columbia v. Heller
– His Heller amicus brief was cited four times in the Court’s Heller opinions
– His brief in McDonald v. Chicago (2010) was cited by Justice Alito’s plurality opinion, and twice by Justice – Stevens’ dissent

https://www.washingtonpost.com/news/volokh-conspiracy/wp/2017/06/19/the-hearing-protection-act-and-silencers/