He grew up in a “blue collar” family in Chicago, Illinois where he learned the values of hard work and dedication from his father, a welder, and mother, a factory assembly worker. In 1993, Greg graduated from Northwestern University in Evanston, Illinois. In 1996, he obtained his law degree from from DePaul College of Law in Chicago, Illinois. He began his career as an attorney at Parad Law Offices in Cook County, Illinois where he worked while attending law school.