307.637.5575 firm@mtslegal.net

William M. McKellar (Bill)

William M. McKellar (Bill) (Of Counsel)

Mr. McKellar has worked as a trial attorney since his admission to the state bars of Wyoming and Colorado in 1982 and has served as lead counsel in over 100 civil jury trials successfully representing both defendants and plaintiffs. Mr. McKellar’s litigation experience includes litigation involving fires and explosions in commercial buildings, oil and gas field, personal residences and oil refineries. Mr. McKellar has represented defendants in such fire cases and has also served as plaintiff’s counsel in such cases on behalf of insurance companies.

Mr. McKellar’s litigation experience also includes personal injury litigation relating to auto accidents, industrial accidents, oil and gas field accidents, rig accidents, medical malpractice, mining accidents, explosions, burn injuries, railroad accidents (including Federal Employers Liability Act – FELA), trucking/semi accidents, construction defects, manufacturing and design defects, recreation accidents, personal injury, catastrophic injury, wrongful death, drownings, brain injuries, spine injuries, amputations, juvenile detention facilities, property and casualty claims, insurance disability claims, insurance fraud, products liability, employment termination, civil rights, medical negligence defense, legal malpractice, declaratory judgment actions and environmental and toxic tort litigation.

He has also practiced and is admitted to practice before the Shoshone and Arapaho Tribal Court on the Wind River Indian Reservation in Fort Washakie, Wyoming. Mr. McKellar has served as lead litigation counsel in CERCLA and RCRA environmental litigation, in the defense of individual and corporate defendants, as well as insured and insurance companies.

Mr. McKellar continues to maintain an extensive mediation, arbitration and alternative dispute resolution (ADR) practice in Wyoming and Colorado. The success of Bill’s mediation practice is bolstered by his extensive experience and background in complex civil litigation. He has mediated countless cases to resolution and settlement in a variety of personal injury, professional malpractice, general liability, personal and catastrophic injury and many other law suits for attorneys throughout Wyoming and Colorado. Mr. McKellar’s ability to successfully mediate disputes is well respected by defendants and plaintiffs alike for his experience, knowledge, and background which he uses to deliver and facilitate a practical, fair and honest approach to resolving complex disputes. Do not hesitate to call our office to inquire about Mr. McKellar’s ability to help you and your client’s find and negotiate a path to resolution for your legal matters through mediation or arbitration. His background, experience, skills and reputation are unmatched.


Mr. McKellar received his undergraduate training at the University of Texas, at Austin, and the University of Northern Colorado, graduating magna cum laude. Mr. McKellar received his Juris Doctorate degree from the University of Wyoming in 1982. He is admitted to practice before all state and federal courts in Wyoming and Colorado, the Tenth Circuit Court of Appeals and the United States Supreme Court.

Professional Memberships:

Defense Lawyers Association of Wyoming
Mr. McKellar holds the rank of Advocate in the Wyoming chapter of the American Board of Trial Advocates (ABOTA) and is a past President of the American Board of Trial Advocates having tried more than 50 civil jury trials to verdict in his career.

Mr. McKellar is a member of the Association of Trial Lawyers of America and the Wyoming Trial Lawyers Association. Mr. McKellar has served as a member of the Board of Directors of the Wyoming Trial Lawyers Association and is a past President of the Wyoming Trial Lawyers Association.

Mr. McKellar is an active member of the Wyoming State Bar and the Laramie County Bar Association in which he served as President from 1990-1991

Mr. McKellar is also recognized by Super Lawyers Corporate Counsel edition in Civil Litigation Defense.