Jason S. Marks was born in Highland Park, Illinois and raised in Lake County. He attended the University of Iowa where he majored in Finance. In May of 1998, Jason received a bachelor's degree in Business Administration (B.B.A) from the University of Iowa. His degree was awarded with Honors and High Distinction placing him in the top 5%of the graduating class.

After receiving his undergraduate degree, Jason attended the DePaul University College of Law in Chicago. He was awarded a Juris Doctor (J.D) degree with Honors from DePaul in May of 2001.

Jason went into private practice following law school. In February of 2002 he began employment at a law firm in Waukegan. He focused on representing individuals in personal injury and workers' compensation claims. Jason was made a partner in the firm in February of 2007.

In 2014, Jason founded Marks & Associates Ltd. with offices in Gurnee and Chicago. At Marks & Associates, Ltd. Jason focuses in representing individuals and families in person injury and workers' compensation claims.

Over the course of his career Jason has recovered millions of dollars for his clients through both settlements and verdicts. He has been recognized by Super Lawyers, a national attorney rating service, as a Rising Star for 2012, 2013, and 2014, an honor bestowed upon only 2.5% of attorneys in the State of Illinois. Jason is a member of the Lake County Bar Association, Illinois State Bar Association, Illinois Trial Lawyers Association and Workers' Compensation Lawyers Association.