Born and raised in Missouri, Shaun attended St. Louis University High School before accepting a soccer scholarship at Vanderbilt University. At Vanderbilt, Shaun  was a Southeastern Conference Scholar Athlete majoring in Communication Studies. Upon graduation, Shaun was accepted to the St. Louis University School of Law where he graduated in 2007. Since that time, Shaun became licensed to practice in Missouri and Illinois, and he has devoted 100% of his practice to representing personal injury victims. 

After law school, Shaun joined a personal injury firm in Collinsville, Illinois before founding the Lieser Law Firm, LLC in March 2011. With offices in St. Louis, Missouri and Belleville, Illinois, the Lieser Law Firm represents victims in both states. Primarily, the Lieser Law Firm focuses on automobile accidents, truck accidents, motorcylce accidents, slip and fall claims, product liability claims, medical malpractice claims, dog bite attacks, wrongful death claims, and claims for workers' compensation.