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Meet Donald C. Sisson

Attorney Donald SissonDonald Sisson

Seasoned Attorney in Denver

Donald Sisson is an accomplished lead counsel with many successful outcomes in various areas of practice including complex civil litigation, construction law, real estate litigation, corporate disputes, and police defense. Bringing confidence and poise to every case, Mr. Sisson has provided numerous clients winning litigation practices.

For the last several years, Mr. Sisson has represented clients in various courts throughout the country. Mr. Sisson has litigated over 100 cases to verdict, in various venues such as arbitration forums, administrative panels (including the Career Service Authority and Civil Service Commission), and State and Federal District Courts. His representation of his clients ranged from individuals and small businesses to very large corporations, in several areas of the law. Mr. Sisson currently serves as General Counsel to the Colorado State Lodge of the Fraternal Order of Police (“FOP”). The FOP provides representation to over 5,000 law enforcement officers in the State of Colorado, concerning issues including internal affairs investigations, due process rights, civil litigation defense, criminal defense, and collective bargaining rights.

In addition to serving as General Counsel to the Colorado State Lodge, Mr. Sisson serves as General Counsel to four other separate FOP entities, including:

  • FOP Labor Counsel
  • FOP Public Safety Awareness Foundation
  • FOP Legal Defense Fund
  • FOP Small Donor Committee

Mr. Sisson is extremely proud and humbled to be able to provide representation to the largest law enforcement organization in the United States and in the State of Colorado.

Bar Admissions

  • State of Colorado
  • United States District Court for the District of Colorado

Professional Memberships

  • Colorado Bar Association
  • American Bar Association
  • Denver Bar Association
  • Colorado Judicial Institute
  • West Point Society of Denver

To secure his representation, feel free to contact our Denver lawyer and schedule an initial consultation.

    Personal Background

    Mr. Sisson was born in East Patchogue, New York in 1976. He attended the United States Military Academy at West Point, New York. While at West Point, Mr. Sisson played Division I college ice hockey. In 1999, Mr. Sisson graduated from West Point with a B.S. in Systems Engineering and a minor in English.

    Upon graduation, Mr. Sisson received his commission into the United States Army as a Finance Officer. Mr. Sisson attended the Finance Officer Basic Course at Fort Jackson, South Carolina. After his successful completion of the Finance Officer Basic Course, Mr. Sisson was stationed at Fort Hood, Texas where he became the Training and Operations Officer for the 230th Finance Battalion in support of the 4th Infantry Division.

    After completing his military service, Mr. Sisson attended law school at the University of Minnesota. During law school, Mr. Sisson received a federal externship with Magistrate Franklin L. Noel of the United States District Court of the District of Minnesota. In addition, Mr. Sisson spent his final semester of law school studying international law at Tilburg University in the Netherlands. After receiving his law degree in 2004, Mr. Sisson moved to Denver, Colorado and started a career in private practice.

    Representative Experience

    • Lead counsel in case defending former Brighton Police Officer, Juston Henninger, against 3rd-Degree Assault, Harassment and Official Misconduct charges. Former Officer Henninger was acquitted of all charges after a three-hour deliberation.
    • Co-counsel in representation of exchange fund member in multi-million dollar securities fraud case, which resulted in favorable settlement.
    • Lead counsel in representation of Colorado Company, against claims by sales director that he was a 1/3 owner of the company, which resulted in nuisance value settlement.
    • Lead counsel in representation of Colorado Insurance Agency against an agent for breach of fiduciary duties, which resulted in a six-figure settlement.
    • Lead counsel in premises liability action against a national company, which resulted in one of the largest Reflex Sympathetic Dystrophy Verdicts on Record.
    • Lead counsel in 1st Amendment Retaliation case against Sheriff Douglas Darr, which resulted in one of the largest awards in Adams County history.
    • Co-counsel in Felony Menacing case against Denver Deputy Sheriff, which resulted in the acquittal on three of four charges. The one charge that he was convicted on, was overturned by the Colorado Supreme Court.
    • Co-counsel in 3rd-Degree Assault case for Adams County Sheriff’s Deputy, Darin Poole, which resulted in full acquittal.
    • Lead counsel in the 3rd-Degree Assault/Harassment case of Denver Deputy Sheriff, Anne Kelly, which resulted in a full acquittal.
    • Lead counsel in Appeal of the termination of two Denver Police Officers, Jose Palomares and David Torrez, which resulted in a reversal of termination by the Civil Service Commission.
    • Lead counsel in Breach of Warranty action against multiple national companies, which resulted in favorable settlement.
    • Co-counsel in Federal District Court Jury Trial, which resulted in a multi-million dollar verdict against Federal Fruit & Produce (one of the largest produce distribution companies in the State of Colorado): Case No. 11-cv-00542-JAP-KLM.
    • Lead counsel in multi-million dollar commercial construction defect case, which resulted in a seven-figure settlement one week before trial.
    • Lead counsel in several mechanic’s lien cases, which have resulted in favorable outcomes for clients.
    • Co-counsel in First Amendment Retaliation case against Pueblo County Sheriff, Kirk Taylor, and the Chain of Command on behalf of Sergeant Thomas McLallen, III, which resulted in a judgment in the amount of $311,600.00, plus attorneys’ fees and costs: Case No. 10-cv-01187-RPM.
    • Obtained acquittal in a case defending Commerce City Police Officer, Robert Price, against charges of Animal Cruelty (Class 6 Felony).
    • Lead counsel in a case defending former Adams County Deputy Sheriff, David Morrow, against 1st Degree Assault charges.
    • Lead counsel in defending Adam's County Deputy Sheriff against Forgery charges.
    • Lead counsel in Class Action/Collective Bargaining Action against the Jefferson County Sheriff’s Department for violations of the FLSA (Fair Labor Standards Act) and Breach of Contract.

    If you wish to know more about our Denver attorney, get in touch with our firm at (303) 500-3995.

    Our Testimonials

    • He demonstrated a thorough understanding of the law, was professional and prepared.

      “Steven Mandelaris was recommended to my husband and me by another attorney and provided legal assistance in a civil matter in which we were the respondents. He demonstrated a thorough understanding of the law, was professional and prepared. He was effective in having the charges dropped prior to the hearing. We are very pleased with his legal services and would highly recommend him.”


    • He provided me the professional and friendly support I needed to get through a very difficult time.

      “Don is an outstanding attorney. He remains knowledgeable and current on laws and judicial procedure especially during these changing times. His interpersonal interactions and demeanor put people at ease with his approach and style. ”


    • Everything was resolved in a surprisingly fast manner and with a better outcome then I could have hoped for.

      “He was very courteous and very knowledgeable and helpful. Everything was resolved in a surprisingly fast manner and with a better outcome then I could have hoped for. Recommend to anyone.”


    • Steve and Patrick were incredible assets to my case, and worked literally for years until we achieved the resolution I was looking for.

      “I hired Steve Mandelaris and Patrick Welsh to assist with my personal injury case following an auto accident with a drunk driver. Steve and Patrick were incredible assets to my case, and worked literally for years until we achieved the resolution I was looking for. I would certainly recommend them to anyone looking for an attorney. They were both knowledgeable and professional and are the reason my case had a happy ending.”


    • He took care of me from start to finish.

      “This was the first time I was involved in a premise liability lawsuit and Steven Mandelaris completely helped me through this very difficult situation. He took care of me from start to finish. Steven recommended an amazing doctor who was able to get me feeling back to normal again. I will always appreciate this attorneys professionalism, knowledge and compassion he gave me as he understood my pain and suffering. I couldn't work and I was in school at the time, I had to quit school due to not feeling well from the fall. Steven was always available when I called or if I sent an e-mail he responded to me immediately. He completed all the paperwork and there wasn't any stress put on me as he is very organized. The settlement ran smoothly and I was kept well informed until the very end. It was a quick and painless process. Thank you, Steve I really, really appreciate all of your hard work and everything you have done for me! I very highly recommend you!”


    Put Our Firm In Your Corner

    Guiding you through the legal process while keeping your goals in mind.
    • Individualized, One-on-One Attention

      The power and influence of a big firm with the attention and service of a smaller office.

    • Nearly Two Decades of Experience

      Resourceful and insightful representation. We know how to build strong cases.

    • Committed to Your Best Interests

      Keeping your goals in mind and offering dedicated guidance through the legal process.

    • Highly Respected by the Community

      We know the courts, how the opposition may act, and use this to our clients' advantage.

    Invincible Attorneys in Action

    With nearly two decades of experience, our team knows and has what it takes to steer your case in the right direction. The attorney you hire immediately commits to seeing your case through the end. We deliver the power and influence of a big firm with the attention and service of a smaller office.

    Contact Our Firm

    Helping Clients Throughout Denver & Surrounding Areas


    501 South Cherry Street,
    Suite 920
    Denver, CO 80246
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