• Bio
  • Credentials

Henry Whitmer


Attorney Henry Whitmer has been practicing law in Arizona for more than a decade. With dozens of felony jury trials under his belt, Henry has handled thousands of criminal cases, ranging from DUIs, assaults, drug crimes, sex offenses, all the way to death penalty murder. Henry taught DUI and court room technique at the Northern Arizona police academy for roughly six years. If it's a crime in Arizona, he has probably handled it.

Attorney Henry Whitmer understands that being charged with a criminal offense can be an earth-shattering event. The stress, worry, and fallout that flow from a criminal charge can be far reaching. Henry is dedicated to the founding principles of this Nation: that a person is innocent until proven guilty; that our constitutional rights are immutable safeguards, not mere inconveniences for the Government; and that every person deserves their day in court.

Henry is licensed to practice in all Arizona state and federal courts, as well as the 9th Circuit Court of Appeals and the United States Supreme Court. Henry started his legal path during his undergraduate years, where he interned at the Arizona Attorney General's Office and the Solicitor General's Office. As a licensed attorney, Henry started in Yuma County, then in Maricopa County, practicing as a homicide prosecutor for nearly nine years in Yavapai County before joining Signature Law Group. Henry's experience ranges from city courts all the way up to the United States Supreme Court.

Mr. Whitmer obtained a degree in philosophy magna cum laude from Barrett, The Honors College at Arizona State University in 2008. Henry graduated with a highest pro bono distinction from the Sandra Day O'Connor School of Law at Arizona State University in 2011. Henry has been published by the Law Review of Phoenix School of Law as well as the Public Policy Incubator Program at the Sandra Day O'Connor College of Law.

Mr. Whitmer is currently a member of Arizona Attorneys for Criminal Justice, the National Association of Criminal Defense Lawyers, as well as serving as Vice Chair Arizona State Bar's Criminal Practice and Procedure Committee, an Elected Precinct Committeeman, a State Committeeman, a Federal Criminal Justice Act panelist, a member of the Northern Arizona Chapter of the Federalist Society, and as one of twelve Arizona advisors to the United States Congressional Commission on Civil Rights.

If you are facing Federal or State charges, schedule a consultation with someone that knows what they are doing: Attorney Henry Whitmer.


    • Arizona State University, Sandra Day O'Connor College of Law, Phoenix, Arizona
      • Honors: Highest Pro Bono Distinction
      • Honors: Phi Delta Phi Legal Honors Society
      • Honors: The Honorable Bruce R. Cohen Integrity Scholar
    • Barrett’s Honors College, Arizona State University
      • Honors: magna cum laude
      • Honors: Thesis - The Legal Procedure of Ancient Rome
      • Major: Certificate in Ethics, The History and Philosophy of Science, and Classical Studies (Latin)

    Published Works

    • Sentencing in Arizona: Recommendations to Reduce Costs and Crime. Sandra Day O’Connor College of Law Public Policy Incubator 2010. Co-Author with Professor Carissa Hessick et al.
    • The Scarlet Letter of the Law: A Place for Shaming Punishments in Arizona. Phoenix School of Law- Law Review, Volume 6, Spring 2013. Co-Author with Michael Lee Dynes, ESQ.

    Classes & Seminars

    • The Twelfth Annual Western History Symposium. Sharlot Hall Museum, August 2015. Law and Order in Yavapai County panel member with Yavapai County Sheriff Scott Mascher and Senior Federal District of Arizona Judge P.G. Rosenblatt.
    • The Legal Environment. Northern Arizona Regional Training Academy, 2016 - 2022. DUI and Moot Court police academy instructor.
    • An Introduction to Sentencing. Arizona Prosecuting Attorney’s Advisory Council (2017).
    • The Sovereign Citizen Movement. Arizona Prosecuting Attorney’s Advisory Council (2019).
    • Lesser Included Offenses. Yavapai County Attorney’s Office (2022).


    • National Association of Criminal Defense Lawyers
    • Phi Delta Phi Legal Honors Fraternity
    • The Federalist Society
    • Arizona Attorneys for Criminal Justice
    • Yavapai County Bar Association
    • Federal Criminal Justice Act - Phoenix and Flagstaff Panel Member

    Contact Signature Law Group

    We’re ready to help. Let’s get started.

    Contact us to discuss your case and learn about how we can help you. Call our Prescott office at (928) 842-8522 or 
    our Gilbert office at (480) 376-1680.

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