In 2009, Mazek launched his private boutique firm, Mazek Law Group, to provide high quality legal representation at affordable rates. The practice is located in the North Center neighborhood of Chicago, and handles cases in the suburbs, Chicago and collar counties.

Mazek represents clients in the areas of real estate transactions (real estate closings, short sales, foreclosures and more), real estate litigation (adverse possession, lot line disputes, condo association conflict), estate planning (wills, trusts and other estate planning instruments), probate, criminal defense (federal criminal defense, state criminal defense, traffic, DUI and more) and bankruptcy (consumer, Chapter 7, Chapter 13).