If you were one of the 2,985,400 adult consumers who listened to  the radio in Southeast Michigan last week, then odds are you heard a commercial for the Law Office of D. Todd Williams. The firm specializes in criminal defense cases involving traffic violations, probation matters, expungements, and serious felonies.

Mr. Williams has been advertising on Detroit radio every single month for the past 23 years.

"Radio advertising has been critical to building my practice," he says. "I can tell the days when my commercials run because those are the days my phones ring."

Shortly after passing the bar exam in 1995, Mr. Williams opened his firm operating from the basement of his Rochester Hills townhouse.

Mr. Williams's first cases came from friends and their referrals.