Law Office of Michael D. Mercer

About the Attorney

The Law Office of Michael D. Mercer is a leading criminal justice attorney in Houston, Texas. Mercer & Keirnan, comprised of Criminal Defense Attorneys John P. Keirnan and Michael Mercer, offer over 38 years of combined experience defending all criminal charges in and around Houston. If you have been arrested or charged with a crime, don’t hesitate to contact Mercer and Keirnan at 713-236-9700 for a free case evaluation. John P. Keirnan, named Lawyer of the Year in 2014, and Michael Mercer are dedicated to providing top-notch legal representation for clients facing criminal charges. Whether you need a criminal attorney, DWI attorney, or a Harris County criminal defense attorney, Mercer and Keirnan have the knowledge and expertise to help you navigate the legal system and achieve the best possible outcome for your case. Trust Mercer & Keirnan to fight for your rights and protect your future.

Practice Areas

Criminal justice attorney

Client Reviews

Shonda
4/10/2026
				Mr. Michael Mercer has been a true blessing to my life. I was pulled over 15 minutes before I was scheduled to be in court. The officer informed me that my vehicle was going to be impounded. I called Mr. Mercer. Thank God he was five minutes behind me in traffic. Mr. Mercer showed suburb customer service.He pulled off of the freeway and on to the grass loaded my belongings into his vehicle. We made it to court. He has never failed to show up and fight for me in and out of the court room. He is a man of great faith. He has genuine care and concern for my future. These are the reasons I not only recommend Mr. Michael Mercer. i would advise you to  allow Mr. Mercer to fight for you.



My case was dismissed on 10/31/2024. Michael Mercer fought for me. He didn't compromise, nor was he lazy. Mr. Mercer kept in contact with throughout the entire process. I am truly blessed as a result of meeting him.

Possession case dropped, a new lease on life! I give God the Glory every chance I get.

Thank You!!!
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Chris Castro
3/27/2026
				Excellent lawyer—handled my case in Harris County while I was in NY and got it dismissed. Reliable, professional, and someone you can trust.
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mercy
3/05/2026
				Lack of communication, showed up late everyday except the last court date. before my initial payment vs during the process was a completely terrible 1year process
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Chey B
8/13/2025
				Honestly, I thank God for Attorney Mercer.  From the start, he was honest, professional, and went above and beyond to fight for me. He dismissed my case! I am deeply thankful for Attorney Mercer. 10/10 - highly recommend! He will fight for you with integrity and skill.
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Maygen Brown
7/20/2025
				I was facing a felony. Real life-changing stuff. I was scared, confused, and didn’t know what direction my life was about to take. The Law Office of Michael D. Mercer stepped in and gave me hope. From the jump, they were transparent, patient, and really put in the work. This wasn’t an easy case—and still, they got my charge dropped from a felony to a misdemeanor. That’s a whole new beginning for me.



They didn’t treat me like just another file on the desk—they treated me like a human being. If you want someone that’ll fight for your future like it’s their own, this is the firm you need.



And if you see more than one review from me—it’s NOT spam, it’s because they earned it. If I could leave a million, I would.
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