He’s the head of Landmark Legal. They file briefs all the time in courts and Congress.
What are you doing?
Mark won a local school board seat when he was (IIRC) 19 years old.
His Landmark Legal in the 1970s took on and beat the Wisconsin teachers union. Landmark legal has fought the NEA for decades. https://landmarklegal.org/wp-content/uploads/2021/08/NEA-IRS-Complaint_Original.pdf
He was chief of staff to Attorney General Ed Meese.
He's written several best-selling books critical of our judicial overlords and in support of return to Constitutional government.
Landmark Legal Foundation is very active in defense of Liberty.
Landmark legal has fought the NEA for decades. https://landmarklegal.org/wp-content/uploads/2021/08/NEA-IRS-Complaint_Original.pdf