Mark A. Grilliot
Phone (314) 726-2310
Fax (314) 726-2360
Mark A. Grilliot is a partner at Boggs, Avellino, Lach, & Boggs, where he focuses on complex commercial litigation. He graduated from Southwestern Law School, where he volunteered at the Small Claims Clinic and the Mass Incarceration Awareness Law Society. He received the CALI award for the highest grade in Sales and Witkin for one of the top grades in Constitutional Law II.
Before joining the firm, Mark gained valuable trial experience as an ABA Certified Law Clerk at the Los Angeles District Attorney's office, Central Trials 11 Division, where he conducted bench trials, argued motions, performed preliminary hearings, and drafted pleadings. As a Partner, Mark handles high-stakes litigation matters, representing insurance companies, transportation companies, and business entities in civil litigation. He also provides strategic counsel to employers on ADA compliance, risk management, contract negotiations, and corporate governance matters.
His extensive experience in trucking litigation includes defending carriers and drivers in catastrophic injury cases, managing complex multi-party disputes, and reviewing preventive safety protocols. In his ADA compliance practice, Mark helps businesses navigate accessibility requirements, implement compliance programs, and defend against accessibility claims.
Witkin Award for Academic Excellence Jan 2021
Earned one of the top grades in Constitutional Law II
CALI Excellence for the Future Award Sep 2020
Earned the highest grade in Sales

Southwestern Law School - J.D.
Indiana University - B.S. in Music and Business
Missouri, 73731
Illinois, 6340195
Kansas, 29469
US District Court for the Eastern District of Missouri
US District Court for the Western District of Missouri
US District Court for the Central District of Illinois
US District Court for the Southern District of Illinois
US District Court for the Northern District of Illinois
United States District Court for the District of Kansas
Civil & Commercial Litigation
Business Law
Contracts
General Insurance Defense
ADA Compliance and Corporate Defense
Motor Carrier Defense
BAMSL
StL County Bar
Girls On The Run - promotes girl empowerment by teaching life skills through lessons and running