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Representing clients in Dayton, Lyon County, Carson City, Reno, and throughout Northern Nevada





At Walther Law Offices, we have the skills and experience you need in order for your business to grow and succeed, whether you have just opened the doors to your business or are working to grow your company. 

We handle a wide range of business law matters, including:

  • Commercial leases

  • Contract law

  • Sale agreements

  • Distribution agreements

  • Mergers/acquisitions

  • Non-compete agreements

  • Non-disclosure agreements

  • HR policies

  • Wage and hour law

  • Discrimination claim defense

Walther Mansfield Brock Mayo is deeply knowledgeable about the unique conservation and public lands opportunities, as well as challenges, facing Nevada and the Western States. 

Our attorney has worked with non-profit conservation groups, ranchers, farmers, as well as members of Capitol Hill, government officials, and other stakeholders in regards to solutions to public lands and conservation issues facing the state of Nevada. 


Walther Mansfield Brock Mayo is uniquely qualified to provide competent representation for people and businesses involved in ranching and farming because we are personally invested in the agriculture way of life and seek to protect it.  Mr. Walther and Mr. Mansfield's families have been involved in Nevada's agriculture for generations, and they continue to live this way in their personal capacity.  WMBM Law has represented ranching and farming clients on all fronts, including contracts and agreements, public land issues, easements, estate planning, conservation issues, deeds, and transactions.  Because the firm is personally and professionally invested in the agriculture way of life, we believe that you and your family's heritage will be safe in our hands. 



When you have been charged with a serious crime, experienced legal representation could be the only thing standing between you and a lengthy jail sentence. We have extensive experience in the field of criminal defense and have represented clients in a wide range of cases, including:

  • Drug crimes, DUI

  • Felonies & Misdemeanors

  • Sex crimes

  • Theft crimes

  • Violent crimes

  • Traffic offenses

  • Assault and battery, domestic violence charges


Estate planning is the process of establishing a plan detailing how property and assets will be handled. This is important to do as early as possible to give you peace of mind and know that your family and loved ones will be cared for.

We handle a wide range of estate planning matters, including:

  • Wills and trusts

  • Probate and estate administration

  • Last will and testament

  • Financial power of attorney

  • Healthcare power of attorney


Divorce and other types of family-related matter are difficult for everyone involved. Our priority is to provide our clients and their families with the level of support and dedication they deserve. Whether you are fighting for child custody or simply want to protect your assets during a divorce, we are here to help. 

A few of the areas we offer representation for include:

  • Guardianships

  • Divorce

  • Child custody

  • Alimony

  • Property division

  • Modifications

  • Paternity

  • Marital agreements



Tel: 775-246-7721

As a fourth generation Northern Nevadan, Mario Walther is no stranger to the unique beauty of this community. After graduating from the University of the Pacific, McGeorge and passing the Nevada Bar, Mario immediately began practicing law in Lyon County. While in law school, Mario served as the Student Bar Association President, and participated in many student associations including the Public Legal Services Society. 


Mario founded Walther Law Offices, after practicing in Lyon County and throughout Nevada for four years. During that time, he has handled criminal defense cases, business litigation, family law, and estate planning. Mario has taken hundreds of criminal cases ranging from minor traffic matters to murders. Mario firmly believes every client deserves fair, thorough representation, and treats each case with passion and integrity. 

During his practice, Mario has gained extensive knowledge of business law, and worked on matters from entity formation of all sizes and many industries, business transactions, to complex civil litigation. Mario strives to provide the same level of attention and sound guidance regardless of the size and complexity of the issues facing his business clients. 

In his spare time, Mario likes to fish, hunt, and explore the great outdoor opportunities Nevada offers. Mario volunteers a significant amount of his time to, and is passionate about natural resource and public lands issues affecting Nevada. 

Tel: 775-246-7721

Patrick was born and raised in Northern Nevada, is a descendant of the 102 Ranch, and maintains strong ties throughout the State.  Patrick attended the University of Nevada, Reno and thereafter pursued his aspiration of practicing law by graduating from the University of Idaho, College of Law.  After law school, Patrick became a law clerk for the Honorable Judge Schlegelmilch of the Third Judicial District Court, and his legal career was propelled.


Subsequent to the judicial clerkship, Patrick was an associate in a small firm in Yerington, Nevada, where he began establishing his practical legal knowledge from a tenured and highly knowledgeable attorney.  During that time, Patrick represented clients in numerous areas of the law including probate, estate planning, criminal defense, family law, guardianship, tenant/landlord, personal injury, debt collection, contracts, quiet title actions, and real property issues.  Despite practicing in a breadth of areas, Patrick was highly successful and gained extensive knowledge in the legal system, legal issues, and the importance of a client relationship. 


Now, Patrick’s primary focus of law is business and transactions, estate planning, probate, and criminal law.  Patrick has represented businesses, individuals, and entities from simplistic issues such as drafting of deeds and review of contracts, to complex litigation.  No matter what route the case must go, Patrick is committed to putting in the work to ensure that each case is handled with the utmost attention and will pursue all avenues to reach the client’s goal.

Tel: 775-246-7721

As a former civil deputy district attorney, Olga Walther joined the firm with valuable knowledge and experience handling numerous practice areas affecting Lyon County and Northern Nevada, including issues in land use planning, real property and real estate transactions, water rights, and public utilities issues. During her time at the County, Olga served as legal counsel to the planning department, working with staff, the planning commission, and the development community to help shape sound policies for our quickly growing community. This experience allowed Olga to work with and witness the unique challenges and opportunities Lyon County provides to new development and business growth. 


Olga also represented the county in the court appointment process of the public guardian to persons who have been declared incompetent or of limited capacity, and advised and represented the child support division of the District Attorney's Office in court master and district court proceedings. Olga's experience with guardianship issues led her to adopt a compassionate and patient approach to family issues, due to the sensitive and personal nature of the issues and significant repercussions of the final outcome. 


Prior her time at the County, Olga worked on healthcare legislation and advised on issues regarding government health programs, including Medicare, Medicaid, the Affordable Care Act, as well as other government health programs. Olga was a frequent recurring speaker on emerging health care compliance issues. 

Tel: 775-246-7721

Kale is a second generation Nevadan, a graduate of the University of Nevada and University of Nevada, Las Vegas’ William S. Boyd School of Law. While in school he was voted outstanding student in the Legal Aid Center of Southern Nevada and received scholarships for academic excellence each year of attendance.

Kale has extensive and wide-ranging legal experience, including working in  the chambers of Federal Judges and multi-state law firms, and running his own successful practice before joining Walther Mansfield Brock Mayo. 

Kale has real trial experience and has litigated in over a dozen different courts and counties across the State. He has successfully handled felony criminal trials, semi-truck accidents, DUIs, car accidents, dog bites, domestic violence charges, and much more. 


Kale was named a 2021 Pro Bono Attorney of the Year by Nevada Legal Services.

Tel: 775-246-7721

Massey Mayo brings 15 years of litigation experience providing legal services to rural Nevadans and has had the privilege of practicing in various courts, and before many Judges, in our great State. As a private litigator, Massey represented clients in family law matters, the adult criminal system, the juvenile system, probate matters, real property matters, guardianships, estate
planning, and other general civil litigation. Massey’s past clients have included businesses, individuals, and children. Massey has won cases before various district courts and at the Nevada Supreme Court.

In 2019, Massey was trained to provide effective mediation in complex family law matters. In July 2021, Massey left private practice to serve as a Court Magistrate in the Sixth Judicial District Court where she made judicial recommendations in cases involving vulnerable children, vulnerable adults, and families in distress. She also presided over settlement conferences for a
variety of legal matters, using the skills she learned as a mediator. Feeling like her work as a litigator was not finished, Massey decided to return to private practice and started her own law firm until joining Walther Mansfield Brock Mayo.


Massey attended the University of Nevada Reno and went on to earn her law degree from the University of Colorado School of Law. During her time in law school, Massey worked at the American Indian Law Clinic and received hands-on experience regarding Indian law issues.


Outside of the Courtroom, Massey is a Mother to five, an active community member, and serves on non-profit organizations. To Massey, Leadership is verb, not a title, it requires action and heart. Massey is dedicated to using her talents to serve others.






15 Main Street, Dayton NV

Tel:  775-246-7721


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Disclaimer: the information on this website is for general information purposes only. Nothing on this site should be taken as legal advice for any individual case or situation. This information is not intended to create, and receipt or viewing does not constitute, an attorney-client relationship.

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