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Don Bivens

Founder & Managing Partner

Don Bivens is a renowned and trusted trial lawyer for complex cases, representing both plaintiffs and defendants. Don’s peers rank him as a “Best Lawyer” across five categories of disputes: (1) Bet-the-Company Litigation; (2) Intellectual Property Litigation; (3) Finance and Banking Litigation; (4) Securities Litigation; and (5) Commercial Litigation;. Don has been named three times “Lawyer of the Year” for financial and banking litigation. Don also conducts investigations for special committees of corporate boards.

Outside the court room Don applies his case analysis experience to service as a neutral mediator and arbitrator. Don is on the roster of Fed Arb, a premiere national provider of arbitration and mediation services. He is also on the commercial and consumer panels of the American Arbitration Association. Don is a former Chair of the Section of Litigation of the American Bar Association,. He currently chairs the ABA Center for Innovation;, which among other things tracks the regulatory innovations approved by state courts to provide legal services to more people who need them, but who cannot afford legal services under the traditional ethical rules for lawyers.

Don is the former President of the State Bar of Arizona,, the Western States Bar Conference, and the Maricopa County Bar Association. He is a member of the American Law Institute. Don is the recipient of the Walter E. Craig Award, given once a year to a lawyer who has demonstrated the highest degree of professional performance and community services.

On a pro bono basis, Don is the Chancellor of the Episcopal Diocese of Arizona.


Sydney Tonsfeldt


Sydney Tonsfeldt received her Juris Doctor from Washington University in St. Louis in 2015, having finished her third year at the Université Paris 1 Panthéon-Sorbonne in Paris, France. As a law student, Sydney served as an editor of her school’s Law Review publication and won the 2014 Southern regional championship of the Jessup International Moot Court team competition.


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Awards and Accolades


Don Bivens has built a reputation for excellence in the legal field. His firm has won numerous awards and accolades, and he has been recognized as one of the top lawyers in Scottsdale and Arizona. Despite being in Business just over a year Don Bivens PLLC has picked up several awards.



2023 “Tier 1 law Firm” Scottsdale

Tier 1 in Bet-the-Company Litigation – ­Newly recognized for Bet-the-Company Litigation for the 2023 edition
Tier 1 in Commercial Litigation – ­Newly recognized for Commercial Litigation for the 2023 edition
Tier 1 in Litigation – Intellectual Property – ­Newly recognized for Litigation – Intellectual Property for the 2023 edition

Securities – ­Newly recognized for Litigation – Securities for the 2023 edition



2023 Best Lawyers

Donald Bivens
Bet-the-Company Litigation
Commercial Litigation
Litigation – Banking and Finance
Litigation – Intellectual Property
Litigation – Securities