O'Brien Law Offices, P.C., Firm Overview

Started in 1998 by Michael O’Brien, the firm set out on a course to differentiate itself from other law firms serving businesses in Chicagoland. Our attorneys regularly practice both the litigation side and transactional side of our practice.

Our firm concentrates in business, banking and real estate law. We litigate commercial foreclosure actions for our bank clients throughout ten counties in Northern Illinois. We also litigate a variety of business disputes and real estate related disputes for numerous business owners, including breach of contract, fiduciary duty, construction disputes, mechanic’s liens, civil fraud and shareholder disputes.

On the other side of our practice, we negotiate and shepherd numerous business acquisitions, contractual relationships and real estate transactions for our clients.

Our transaction practice includes contract preparation and negotiation, formation of new companies, mergers and acquisitions, development and sale of commercial real estate, employment issues, and general corporate advising.

Litigation And Transactions

We practice both in litigation and in transactions. Most attorneys choose one or the other. Each one helps inform the other. Litigating over the language in a contract makes a lawyer more sensitive about how to word the next contract he drafts. We take advantage of that fact all of the time in our office.


Another distinguishing feature of O'Brien Law Offices, P.C. is our responsiveness to our clients’ needs. After the initial meeting, most of our communications are done by email. Our goal is to respond to clients within a 24-hour period.

The size of our firm allows us to quickly do a conflict of interest check. It does not have to go to a committee meeting with layers of bureaucracy.

Michael O’Brien, “We are big enough to get the job done but small enough to care.”

Legal Team

In addition to Michael O’Brien, the firm utilizes a number of attorneys in of counsel relationships including Leslie G. Bleifuss, Paul J. Haske and William J. Wylie. This team brings a combined experience of nearly 100 years in the practice of law.

Practice Areas