Cory Tyszka

Lance R. Broberg is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Lance R., 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 Lance R. is held by other top lawyers in the same geographic and legal practice area.

Throughout his career, Andy has developed a reputation as a skilled negotiator and trusted advisor for complex businesses. His experience representing buyers, sellers, startup entrepreneurs, and investors has enriched his expertise in understanding transactions from multiple angles. The bulk of Andy’s practice revolves around sophisticated business transactions as well as serving as outside general counsel to private businesses and nonprofits working alongside Boards of Directors, CEOs,...

Colin was appointed a Judge of the Maricopa County Superior Court in 1990 after twelve years of practicing both civil and criminal trial law. During his 17 years as a Judge, he sat on assignments related to nearly every area of law including civil, criminal, juvenile, and family matters. He was Presiding Judge from 2000 to 2005. After his retirement from the Bench, Colin returned to Osborn Maledon in 2007 where he maintains an active personal injury tort, commercial litigation, and public law...

William R. DeHaan has focused his practice in the area of municipal finance since 1986. He has served as bond counsel, underwriter's counsel, issuer's counsel and trustee's counsel in an extensive range of municipal financings, including general obligation, enterprise (utility) revenue, school district, housing, student loan, 501(c)(3) and special districts. Prior to joining the firm in 2001, Bill was the office managing partner for the Phoenix office of a national law firm.

Marcia Busching’s legal practice is primarily devoted to arbitration, real estate, construction, and complex business matters, with significant experience in construction and commercial arbitration. With service on American Arbitration Association (AAA) panels spanning three decades, including international arbitration, Marcia is in demand for a wide variety of very significant construction and business disputes as well as consumer and smaller disputes. Presently, she is a member of the...

Kristin counsels and defends employers of all sizes and across a wide spectrum of industries with an emphasis on providing clients with proactive strategies to manage litigation risk and ensure compliance with complex and ever-changing employment laws. She is a trusted advisor, drawing on her knowledge of state and federal employment laws to counsel clients on a wide range of employment-related issues, including wage and hour issues, discrimination and harassment, employee leave issues, workp...

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.

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.

Jake B. Smith is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law and Tax Law. Jake B., 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 Jake B. is held by other top lawyers in the same geographic and legal practice area.

Diane M. Johnsen is a top attorney recognized by Best Lawyers in the practice area(s) of Appellate Practice, Commercial Litigation and Environmental Law. Diane M., who practices law in Phoenix, Arizona, has been recognized since 2005. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Diane M. is held by other top lawyers in the same geographic and legal practice area.