Our Attorneys

Attorneys Mark Hammer and Nicole Chiravollatti have dedicated their professional careers to criminal law. Former prosecutors who bring more than 30 years of experience to each and every case, our St. Louis criminal defense lawyers have proven that experience truly matters. Our background in hundreds of criminal trials and federal court cases has been used to successfully handle the full range of criminal defense matters our firm receives. While our clients always get the skilled representation they need to defend against their allegations, they also benefit immensely from the personal commitment and earnest support we provide. Take a moment to view our attorneys' profiles. When you want personal support and proven representation, you need to bring The Hammer Law Firm, LLC to the fight.

Recognized in the industry

  • National Association of Criminal Defense Lawyers
    National Association of Criminal Defense Lawyers
  • American Bar Association
    American Bar Association
  • The Bar Association of Metropolitan St. Louis
    The Bar Association of Metropolitan St. Louis
  • Missouri Association of Criminal Defense Lawyers
    Missouri Association of Criminal Defense Lawyers

Client Testimonials

  • "I could not have imagined getting through this difficult and uncertain time without the help of the Hammer Law Firm."
    - E.M
  • "You don't know how much of a blessing you are to us"
    - C.G
  • "Mark and Nicole are the best law firm partners ever."
    - C.E
  • "Mark and Nicole are the best at getting to the truth of the matter and dedicated to your clients"
    - Vicki H.
  • "Mark Hammer is a decisive, direct, and conscientious attorney. I would definitely recommend him to others."
    - Anonymous
  • "Mark Hammer is a gentleman, exudes confidence and relieves stress with his truth"
    - Anonymous

Why Trust Our Legal Team?

  1. More than 30 years of criminal law experience.
  2. Former prosecutors who know how the
    "other side" operates.
  3. Accessibility and availability – clients can
    always reach our attorneys.
  4. Personalized, one-on-one attention.
  5. Tough negotiators and proven trial lawyers.
Get Immediate Help

Our attorneys are dedicated to working
directly with all our clients.

  • Please enter your name.
  • Please enter your email address.
    This isn't a valid email address.
  • This isn't a valid phone number.
  • Please make a selection.
  • Please enter a message.