Mark A. Hammer

Mark Hammer

Dedicated to the Protection of Your Rights

As a founding lawyer of The Hammer Law Firm, LLC, Mark A. Hammer has built a practice that focuses exclusively on criminal defense and the client. Additionally, he draws from extensive experience and insight gained as a former prosecutor to handle each case as effectively and intelligently as possible. As a simple result of his talent, experience, and commitment to making a real difference in the lives of clients and their loved ones, Mark has proven successful in hundreds of criminal trials at both the state and federal level.

Mark earned his B.S. and law degree from the University of Iowa, Iowa City before spending over 13 years as an assistant prosecuting attorney in Washington and Minnesota. This experience enabled Mark to effectively gauge the other side’s actions and intentions when representing defendants and provided him with insight he leverages in each case our firm handles.

A committed member of the community, Mark has served as a Lead Panel Attorney for the Eastern District of Missouri’s Criminal Justice Act Program, has dedicated time to pro bono representation, and has volunteered for the ALS Association. He has also taught legal classes and seminars on trial advocacy and trial practice as several schools of higher education.

Mark’s extensive experience and genuine demeanor make clients feel confident in choosing The Hammer Law Firm, LLC to help them through difficult times. Be confident in choosing us. Our firm is located in St. Louis, Missouri, and serves clients throughout the metropolitan area and statewide throughout Missouri. The choice of a lawyer is an important decision and should not be based solely upon advertisements. This disclosure is required by rule of the Supreme Court of Missouri.

Litigation Percentage

  • 100% of Practice Devoted to Criminal Defense Litigation

Bar Admissions

  • Missouri
  • Minnesota
  • Washington
  • California
  • U.S. District Court Eastern District of Missouri
  • U.S. District Court Western District of Missouri
  • U.S. District Court Southern District of Illinois
  • U.S. District Court Central District of California
  • U.S. District Court Southern District of California
  • U.S. District Court Northern District of California
  • U.S. District Court of Colorado
  • U.S. District Court Southern District Indiana
  • U.S. Court of Appeals, 8th Circuit
  • U.S. Court of Appeals, 9th Circuit


  • University of Iowa College of Law, Iowa City, Iowa
    • J.D. - 1986
    • Law Review: Associate Editor, Iowa Law Review
    • Moot Court - Case Editor (Executive Board)
  • University of Iowa, Iowa City, Iowa
    • B.S. - 1984


  • Adjunct Professor of Law: Criminal Trial Practice, Saint Louis University School of Law
  • Adjunct Professor of Law, Criminal Trial Advocacy, William Mitchell College of Law
  • Faculty Member, National Prosecution Advocacy Center, University of South Carolina, Advanced Trial Advocacy

Professional Associations and Memberships

  • American Bar Association
  • National Association of Criminal Defense Attorneys
  • Missouri Association of Criminal Defense Attorneys
  • Bar Association of Metropolitan Saint Louis
  • Master of the Bench, Theodore McMillian American Inn of Court

Past Employment Positions

  • Assistant Prosecuting Attorney
    • Ramsey County (St. Paul)
    • Hennepin County (Minneapolis)
    • King County (Seattle)
  • Associate (Civil) Attorney, Brobeck, Phleger & Harrison, Los Angeles, California
  • Airline Transport Pilot, Comair (Delta) Airlines
  • Federal Flight Deck Officer, Department of Homeland Security

Special Appointments

  • “Lead Panel Attorney” for the Eastern District of the Missouri’s Criminal Justice Act (CJA) Program

Community Involvement

  • Mark is a volunteer for the ALS Association and actively involved in the mission to find a cure for ALS (Lou Gehrig's Disease)

Pro Bono Activities

  • Represented Death Row Defendant on Capital Appeal to Cal. Supreme Court, sentence commuted to life imprisonment
  • Exploring Your Best Options

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The Hammer Law Firm, LLC
St. Louis Criminal Defense Lawyer
Located at:

1430 Washington Avenue, Suite 325
St. Louis, MO 63103. View Map
Phone: (314) 334-3807
(314) 856-5665
© 2017 All Rights Reserved.
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