Gregg concentrates on zealously representing victims of catastrophic injuries. Gregg has spent his entire legal career fighting for severely injured individuals against insurance companies and large corporations. Gregg strongly believes that his job is to balance the scales of justice in a society that often times hinders individual victims from recovering fair compensation against large and powerful special interest groups. In furtherance of these goals, Gregg has tried numerous personal injury cases to verdict and has multiple recoveries in excess of a million dollars. Gregg has obtained substantial recoveries for victims of construction accidents, medical malpractice and injuries caused by unreasonably dangerous and defective products. Gregg believes that the foundation for a successful winning legal strategy is his teamwork with his clients. Gregg takes pride in getting his hands dirty and doing whatever it takes to get the job done.

Gregg is admitted to practice in all Illinois courts, including every Federal District Court in Illinois (Northern District of Illinois, Central District of Illinois and Southern District of Illinois). Gregg is admitted to practice in the Southern District of Indiana, Northern District of Indiana, Eastern District of Michigan and the 7th Circuit Court of Appeals. Gregg is a member of the American Trial Lawyers Association and the Illinois Trial Lawyers Association. ATLA and ITLA, and their membership, focus on educating and assisting trial lawyers in obtaining fair compensation for victims of catastrophic accidents. Gregg is active in the 7th Circuit Bar Association, the Illinois Bar Association and the St. Clair County Bar Association.

Gregg was raised in Waterloo, Illinois and is a product of the fine teachers in the Illinois Public School System. He attended Waterloo High School serving as his graduating class President. Gregg attended the University of Illinois, Champaign-Urbana where he received a BS in Finance. During his studies at the University of Illinois, Gregg competed for the Varsity Men's Tennis Team. Gregg attended law school at Indiana University in Bloomington Indiana. Gregg represented indigent clients in the Legal Clinic while attending law school. Gregg is active in continuing an association with his law school participating as a Judge for Moot Court Competitions wherein students practice Oral Advocacy.

Gregg has been married to Rana Strellis every year of the 21st century and they have a son, Zack Freedom Strellis and daughter, Kate Liberty Strellis. Gregg's wife is a Human Resources Director at Baxter Healthcare Corporation located in Deerfield, Illinois. Gregg's older brother Dan Strellis holds a PhD in Nuclear Engineering and works for OSI Systems, Inc. and is actively engaged in securing our homeland by designing state of the art contraband and weapon detection systems.