MERCER & KEIRNAN
HOUSTON CRIMINAL DEFENSE ATTORNEYS
"Experience Matters"
713.236.9700
(Hablamos Español)
Tell Us About Your Case
Top Criminal Defense Attorney in Houston
Top DWI Attorney in Houston
Top Assault Defense Lawyer and Drug Lawyer Casey Keirnan
Top Criminal Defense Attorney in Houston
Harris County Criminal Lawyers Association (2014)
Our Firm
Mercer & Keirnan is a criminal defense law firm based in Houston, TX. Defense attorneys Michael D. Mercer and John "Casey" Keirnan co-founded "Mercer & Keirnan" in 2012 to provide high quality, experienced legal representation for anyone accused of a crime.
The family tandem of John Keirnan and Michael Mercer have over 55 years of combined experience and are renowned by fellow criminal defense lawyers and by former Mercer & Keirnan clients as one of the best criminal defense firms in Houston.
John P. "Casey" Keirnan
Top Houston Criminal Defense Lawyer
Mercer & Keirnan
917 Franklin St #550
Houston, TX 77002
P: (713) 236-9700
F: (713) 236-1802
email: Jkeirnan@hotmail.com
John P. Keirnan, aka "Casey" Keirnan, has practiced criminal defense in Houston for over 45 years. His cases frequently appear in local and national news media. Mr. Keirnan is renowned both in Texas and around the country as a top criminal defense lawyer who truly cares for the people he represents.
In 2014, the Harris County Criminal Lawyers Association awarded Casey the coveted "Lawyer of the Year" award for his outstanding work in the field of criminal defense.
In 2024, the Harris County Criminal Lawyers Association honored Mr. Keirnan with the Lifetime Achievement Award, recognizing his amazing 45 year career as a top criminal defense attorney in Houston, Texas.
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Online Solicitation of a Minor
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Violent Crimes
Mercer & Keirnan
917 Franklin St #550
Houston, TX 77002
P: (713) 236-9700
F: (713) 236-1802
email: mikedmercer@gmail.com
Michael D. Mercer
Top Houston Criminal Defense Lawyer
Houston criminal defense lawyer Michael D. Mercer worked for the Harris County District Attorney's office for one year before founding the criminal defense law firm of Mercer & Keirnan in 2012. Former clients often rave about the incredible results Michael achieves for them in their time of need.
Over the past 13 years, Mr. Mercer has handled over 2000 misdemeanor and felony cases in and around Harris County, Texas. The vast majority of his cases result in either a dismissal or a not guilty verdict.
Michael lives in Houston with his wife and three children. In addition to being a talented musician, Michael is a member of an award winning BBQ team here in Houston that regularly competes at the Houston Livestock Show and Rodeo as well as other local county fairs.
Client Reviews
MERCER & KEIRNAN
Average Rating: 5 out of 5 (11 reviews)
"Michael Mercer is a personal, professional, empathetic, diligent, caring and hard working who has the optimum interests of his clients at heart. He recently represented me in an assault family member case against me. Constantly assured me when I was down there was no evidence against me. He worked hard to have all cases dismissed in a lightning speed of time."
by A. O. January 29, 2024
"I hired a top Houston drug lawyer with Mercer and Keirnan to defend my possession of a Controlled Substance Case. After a free consultation with Criminal defense attorney Michael Mercer, Mercer and Keirnan signed on to my case and after a few months my felony drug charge was dismissed!"
by RG One February 5, 2019
"Never been in trouble before and now I couldn't bond out of jail and had a court appointed lawyer who gave me little hope. I found defense attorney Casey Keirnan and Michael Mercer because of their experience as a theft defense lawyer. They replaced my court appointed attorney and everything changed."
by D. O. August 27, 2018
"I hired Mercer and Keirnan because of their experience handling DWIs and other charges. Working closely with them throughout my case, it became very clear that I had made the right decision..."
by T. M. December 30, 2018