John Masslon

John Masslon is a Counsel at Keller Postman LLC, where he works on a broad range of disputes, including products liability and consumer protections suits. He helps develop legal strategies, writes briefs, and presents argument on legal questions. Before joining Keller Postman, John was senior litigation counsel at Washington Legal Foundation. There, he wrote about 100 amicus briefs supporting free enterprise in courts across the country. He filed the first amicus brief in the Supreme Court supporting the challenge to OSHA’s vaccine mandate. He also filed a brief supporting ending the in-house proceedings at the Securities and Exchange Commission. Previously, John served as assistant solicitor general in a state attorney general’s office. There, he was first chair in a federal trial challenging a state election law that was ultimately upheld. He also wrote the briefs that convinced the state supreme court to uphold the State’s right-to-work statute.

John obtained his B.S. in economics with a minor in mathematical sciences from Clemson University. He then received his J.D. and LL.M. in Taxation from Georgetown University Law Center. After law school, John worked for Judge Arthur J. Schwab of the United States District Court for the Western District of Pennsylvania and clerked for Judge Judith Ference Olson of the Superior Court of Pennsylvania.