Mason & Isaacson

Serving the Southwest for over 50 Years.

Practice Areas

Our firm is located in the Land of Enchantment in beautiful Gallup, New Mexico. We have a general civil practice with an emphasis on defense litigation, business law, tribal courts, and Indian law.  We regularly represent tribes, governments, insurance companies and other entities across the country in Federal, State and Tribal courts.

Civil Practice

Trial Practice

  • Insurance Defense
  • Government Entity Defense
  • Federal Indian Law
  • Tribal Court Litigation
  • Federal Law and Litigation
  • Employment Law
  • Commercial Litigation
  • Tribal Court 

Contact Us

Phone: (505) 722-4463
Fax: (505) 722-2629

104 E. Aztec Ave. P.O. Box 1772 Gallup, NM 87305

Our Attorneys

James jay Mason

James Jay Mason is the founding partner of Mason & Isaacson. His primary areas of practice are Trial Practice; Appellate Practice; Tribal Courts; Indian Law; Governmental Defense Law; Real Estate Law; Estate Planning Law; Corporate Law; Partnership Law; and Water Rights Law.

University of Kansas, magna cum lauda, 1971 (B.A.)
Law School: University of New Mexico, 1975 (J.D.)

1975, New Mexico;
1977, Navajo Nation Tribal Court

McKinley County Bar Association; State Bar of New Mexico (Member, Board of Bar Commissioners, 1983-1993; Secretary-Treasurer, 1986-1987; Vice-President, 1987-1988; President, 1989-1990; President, 2003-2004; Member, Health Law, Natural Resources and Indian Law Sections); Equal Access to Justice (Board Member 1990-2007, President 2003-2007); Navajo Nation Bar Association (Chairman, Disciplinary Committee, 1980—); Hopi Tribal Bar Association; National Lawyers Association. Phi Beta Kappa. Editor, New Mexico Law Review, 1974-1975. Law Clerk, Justices Donnan Stephenson and Mack Easley, New Mexico Supreme Court, 1975-1976.

James Jay Mason
Thomas Lynn Isaacson

thomas lynn isaacson

Thomas Lynn Isaacson is a partner at Mason & Isaacson. His areas of practice include Trial Practice; Appellate Practice; Insurance Defense Law; Governmental Defense Law; Indian Law; Real Estate Law; Corporate Law; Partnership Law; and General Litigation Defense Law.

University of New Mexico, magna cum laude, 1978 (B.A.)
Law School: University of New Mexico, 1981 (J.D.)

1981, New Mexico;
1982, Zuni Tribal Court;
1995, Navajo Nation Tribal Court and Laguna Tribal Court


McKinley County Bar Association (President, 1983-1984); State Bar of New Mexico (Member, Board of Directors, Young Lawyers Division, 1985-1989); Navajo Nation Bar Association; Zuni Tribal Bar Association; Laguna Tribal Bar Association; New Mexico Defense Lawyers Association; Defense Research Institute.Phi Beta Kappa. Processing Editor, New Mexico Law Review, 1980-1981. Author: “The Use of the Criminal Information after the Return of a Grand Jury No Bill,” 10 New Mexico Law Review, 1979-1980.

patrick t. mason

Patrick T Mason is a partner at Mason & Isaacson. His areas of practice include Indian/Tribal Law and Practice; Federal Practice; Trial Practice; Appellate Practice; Insurance Defense Law; Governmental Defense Law; Real Estate Law; Estate Planning Law; Corporate Law; and Partnership Law

Thomas Aquinas College, 2003 (B.A.)
St. Johns School of Law 2006
University of New Mexico, 2007 (J.D.)

2007, New Mexico;
2008, Navajo Nation;
2008, New Mexico Federal Court;
2015, Colorado Federal Court;
2015, Arizona Federal Court
2015, 11th Circuit Court of Appeals
2015, 10th Circuit Court of Appeals
2019, U.S. Supreme Court


President of McKinley County Bar Association (Current); Defense Lawyers Association; Secretary of Equal Access to Justice (Past); Secretary of Gallup Economic Development Corporation (Current); President of Gallup-McKinley County Chamber of Commerce (Past); President of the Land of Enchantment Opera (Past); Board of the Knights of Columbus (Current)

Michael A Venegas

Michael a. venegas

Michael A Venegas is an associate at Mason & Isaacson. His areas of practice include Trial Practice; Appellate Practice; Indian Law; Governmental Defense Law; Real Estate Law; Estate Planning Law; Corporate Law; Partnership Law; Water Rights Law.

Thomas Aquinas College, B.A., 1987
Law School: George Mason University School of Law, J.D., 1994

1995, New Mexico;
1996, Navajo Nation;
1997, Hopi Tribal Court;
2001, Arizona

McKinley County Bar Association (President, 2001-2002); State Bar of New Mexico; State Bar of Arizona; Navajo Nation Bar Association; Hopi Tribal Bar Association; National Lawyers Association.

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