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Jones & Keller Welcomes Mark Appleton as Special Counsel

July 07, 2026

Mark Appleton has joined the Jones & Keller as Special Counsel in its Denver office.

Jones & Keller, P.C. is pleased to announce that Mark Appleton has joined the firm. Mark handles all aspects of civil litigation, with particular depth in securities and commodities litigation, investment-related litigation, commercial and business litigation, banking litigation, and real estate investment litigation.

Mr. Appleton is a seasoned trial attorney with more than 41 years of experience practicing at large and mid-size Denver firms. He has tried numerous jury and bench trials in Colorado and Nebraska and has handled more than 50 securities arbitration hearings and trials. Earlier in his career, while serving as regional trial counsel for the United States Securities and Exchange Commission, Mark tried Rule 10b-5 securities fraud cases before administrative law judges. Mark’s practice also encompasses claims under the Colorado Organized Crime Control Act (COCCA), professional liability defense, and regulatory defense. In addition to his litigation work, Mark also works in the areas of securities, securities offerings, capital formation, finance, and corporate matters.

Mr. Appleton earned his Bachelor of Arts from the University of Utah, Salt Lake City, his MBA from the University of Colorado and his Juris Doctor from the University of Wyoming School of Law.

Join us in welcoming Mark, he can be reached at mappleton@joneskeller.com.

About Jones & Keller P.C.

Jones & Keller, P.C. is a full-service business law firm with Denver roots and an international reach. The experienced and award-winning lawyers at Jones & Keller are trusted advisers to some of the most sophisticated individuals, entities and enterprises across the globe. Visit JonesKeller.com.