For more than 100 years, Attorneys Partnering Together to Serve our Community.

For more than 100 years, Attorneys Partnering Together to Serve our Community.

Year of the River Mural

Funded by Indiana State University’s Strategic Plan “Energize Downtown”, the Gilbert Wilson Mural project has produced various murals around Terre Haute. An additional mural was added by artists Michael Neary and Amy MacLennan on the west wall of Cox, Zwerner, Gambill & Sullivan, LLP. Neary and MacLennan began painting the mural in May 2013 and completed it by August 2013. The mural focuses on the 2013 Year of the River initiative and celebrates the role that the Wabash River plays in the Terre Haute community.

About Our Firm

“The best pieces of advice I ever got from him were to remember that the opposing lawyer in a lawsuit is your opponent, not your enemy, ‘so treat him with respect,’ and remember to be careful how you treat people on the way up because you never know when you might run into them on the way down. I’ve tried to follow both of those.”

– David Sullivan, speaking of his father, James Sullivan.


Our Founders:

  • Ernest J. Zwerner (1918-1980)
  • Benjamin G. Cox (1915-1988)
  • Gilbert W. Gambill, Jr. (1921-2001)
  • James E. Sullivan (1919– 2018)
  • Guille Cox, Jr. (1946 – 2019)


Our Attorneys:


Core Principles Of Practice Passed Down By Our Founders



The Firm Founders imbedded the ethos of Respect into every aspect of our legal practice. We respect our clients by offering skilled and experienced representation for every matter. We respect our adversaries by understanding the difference between an opponent and an enemy. We know for our business clients this is critically important because an opponent in one matter may become a partner for another.



For more than 100 years the Founders of  Cox, Zwerner, Gambill & Sullivan, LLP, built long-lasting relationships with clients and community partners. The Firm is deeply rooted here in Terre Haute, and our Attorneys greatly value our loyal clientele throughout the region and plan to remain a steady hand guiding our clients and community into the future.



Part of what makes the Firm able to provide the steady and consistently excellent legal counsel on which our clients and community partners rely is the collaboration of our Attorneys with each other. With more than 180 years of combined legal experience, across diverse practice areas, our Attorney’s teamwork benefit our clients with wholistic representation. We work together to ensure that our clients receive the counsel they need, to resolve their legal issues as effectively and efficiently as possible.


Contact Us

Call our Firm at 812-232-6003 to schedule an appointment at our historic Terre Haute office,1 a Zoom conference call or use our online form.

Parking – The Firm provides complimentary, convenient parking for all of our clients in the parking lot at the corner of Wabash Avenue and Fifth Street in Terre Haute. Parking is for clients and staff only. In order to activate the parking gate, press the small black button located on the lower left-hand side of the gate box. Parking is for clients and staff only. All others will be towed at owner’s expense.

A Tradition Of Experienced Representation