Charles W. Wirken

Known for his extensive work in corporate and business law, Michael Aguirre excels at helping organizations of all sizes and maturities address complex legal and business challenges. Michael has wide-ranging experience in corporate finance, mergers and acquisitions, and general business transactions, as well as counseling executive teams and boards on corporate governance and various corporate matters. He has also advised clients in complex state, federal, and local regulatory environments, i...

Chris is a member of Keller Rohrback’s Complex Litigation and Bankruptcy Groups. He has represented debtors, creditors, Court-appointed committees, and asset purchasers in Chapter 11 reorganization proceedings and workouts. In recent years he has also focused on representing plaintiffs in ERISA class actions. Chris has wide-ranging experience in complex commercial matters, from corporate restructuring to breach of fiduciary duty, commercial real estate, contracts, patent infringement, a...

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.

Patrick Clisham has extensive experience representing clients in complex corporate transactions, including loan documentation and restructurings, asset acquisitions and sales, lease negotiations and enforcement, and business transactions. Patrick’s experience primarily derives from representing secured and unsecured creditors, corporate debtors, trustees and examiners in corporate bankruptcy proceedings and out of court workouts.Patrick joined Engelman Berger in 2009 after relocating fr...

Kent serves as the Managing Partner of Coppersmith Brockelman. He represents employers in a wide variety of employment matters and serves as principal outside employment counsel for a number of employers headquartered or with substantial operations in Arizona. His regular work includes complex employment litigation in state and federal courts and other sorts of employment-related dispute resolution, including arbitrations and administrative proceedings, drafting employment contracts and polic...

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.

Craig Waugh is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Craig, who practices law in Phoenix, Arizona, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Craig is held by other top lawyers in the same geographic and legal practice area.

JIM O'SULLIVAN represents closely-held businesses, including law firms and other service professionals. Serving as general counsel and primary contact for businesses and their owners, Jim focuses on the ongoing legal needs of these clients, as well as strategic planning for growth and ownership succession opportunities. Jim leverages his considerable planning, negotiation and contract drafting experience to counsel clients through key events such as business formation, joint ventures, mergers...

Roger M. Stahl is a top attorney recognized by Best Lawyers in the practice area(s) of Real Estate Law and Trusts and Estates. Roger M., who practices law in Phoenix, Arizona, has been recognized since 2027. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Roger M. is held by other top lawyers in the same geographic and legal practice area.

Kevin is a shareholder, member of the Gallagher & Kennedy board of directors, and head of the firm’s litigation and public bidding and procurement departments. He is keenly attuned to the needs of his clients, developing strategy and implementing solutions that are singularly focused on their goals. Over his 30 year career, his litigation skills have been honed to a razor’s edge, and his civil litigation experience is extensive and far reaching, both in and out of the courtroo...