Michael W. Halvorson

Matthew Joy is a top attorney recognized by Best Lawyers in the practice area(s) of Environmental Law, Litigation - Environmental and Natural Resources Law. Matthew, who practices law in Phoenix, Arizona, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Matthew is held by other top lawyers in the same geographic and legal practice area.

Tod F. Schleier is a top attorney recognized by Best Lawyers in the practice area(s) of Employment Law - Individuals and Litigation - Labor and Employment. Tod F., who practices law in Phoenix, Arizona, has been recognized since 1989. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Tod F. is held by other top lawyers in the same geographic and legal practice area.

P. Derek Petersen is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation - Environmental. P. Derek, who practices law in Phoenix, Arizona, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which P. Derek is held by other top lawyers in the same geographic and legal practice area.

Anthony L. Marks is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Anthony L., who practices law in Phoenix, Arizona, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Anthony L. is held by other top lawyers in the same geographic and legal practice area.

Sam’s practice centers on business and transactional issues, with an emphasis on business organization, governance and compliance, exempt organizations, contract negotiation, land use, and business planning. He has more than three decades of experience assisting both local and national businesses and nonprofits as well as individuals and small businesses. Sam also has extensive political and governmental experience. As a member of the U.S. House of Representatives, he served as a member...

Isaac S. Crum assists business clients in developing, protecting, and enforcing intellectual property rights through consulting and litigation. His experience includes advising consumer product companies, startups, and non-profit organizations on intellectual property strategies and litigating complex cases involving patents, trademarks, trade dress, copyrights, trade secrets, and unfair competition.

For more than 25 years, Mark has offered intelligent and persistent advocacy for his clients involved in complex litigation matters. In the process, he has helped clients ranging from the State of Arizona to the Arizona Cardinals achieve their objectives, even when doing so required trips to the court of appeals to confirm correct rulings by a trial court or reverse errant ones. Mark’s thorough analysis of evidence in complex cases often leads to key connections among facts that aid in ...

Gary Fletcher is a top attorney recognized by Best Lawyers in the practice area(s) of Real Estate Law and Trusts and Estates. Gary, who practices law in Phoenix, Arizona, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Gary is held by other top lawyers in the same geographic and legal practice area.

Theresa’s practice has been spent in fast-paced jury trials, employment and fair housing litigation, and appellate work. In her criminal practice, Theresa handled cases involving fraudulent schemes, tax fraud, real estate fraud, and racketeering. Theresa is a regular presenter to lawyers and the community on topics including Civil Rights, Harassment Free Work Environments, and the Rules of Evidence. Before joining Osborn Maledon, Theresa served as Section Chief Counsel for the Arizona A...

Andy is a seasoned senior litigator with 45 years of experience and a national reputation in business, antitrust, health care law, government contracting, and procurement and appeals. He is also one of Arizona’s best-known experts in election law, having represented a wide array of elected officials and campaigns, including former Arizona Governor Janet Napolitano, Phoenix Mayor Phil Gordon, and a number of initiative and referendum campaigns. He also is a Judge Pro Tem on the Maricopa ...