Mark S. O'Connor

Shareholder David Villadolid is the senior partner in the firm’s Employment Law section and is recognized as an AV® Preeminent™* 5.0 out of 5 peer review rated attorney in Martindale-Hubbell. With more than 37 years of legal practice, David successfully advises companies, executives, and management on a broad spectrum of business and employment issues including compliance with state and federal laws and regulations. Clients express confidence in David’s ability to provid...

DANIEL P. QUIGLEY is a CDQ partner and the Vice President of the firm. He has been practicing law in Arizona since 1984. Since joining CDQ in 1997, Dan has practiced in all areas of commercial litigation, including cases raising antitrust and intellectual property issues. Dan has lectured at the State Bar of Arizona’s Professionalism courses and been an instructor at the National Institute for Trial Advocacy’s Arizona Deposition Skills Program. He is a member of the Xavier College...

John B. Weldon, Jr. is a lawyer recognized by Best Lawyers in the practice areas of Environmental Law, Native American Law, Natural Resources Law and Water Law. John B. practices law in Phoenix, Arizona Best Lawyers has recognized John B. Weldon, Jr. since 1993. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which John B. Weldon, Jr. is held by other lawyers.

Trisha Farrow is a lawyer recognized by Best Lawyers in the practice area of Tax Law. Trisha practices law in Phoenix, Arizona Best Lawyers has recognized Trisha Farrow since 2027. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Trisha Farrow is held by other lawyers.

Frank G. Long advises clients and represents them in court in matters related to trademarks, trade dress, false advertising, copyright, cybersquatting and trade secrets. His clients include, and have included, Fortune 500 corporations and small businesses, as well as national and international companies, and franchise systems. Frank assists clients with the development, administration and strategies for the protection of intellectual property rights, especially trademarks. He has a wide range...

Ben Cooper advocates for clients in high-stakes appeals and writ proceedings in the U.S. Supreme Court, federal circuit courts, and state supreme and intermediate appellate courts from coast to coast. Ben’s practice also emphasizes both trial-court and appellate representation in such fields as intellectual-property protection and e-commerce disputes; federal, state, and local taxation; insurance coverage and bad-faith defense; and public pension plans. In the U.S. Court of Appeals for ...

Education: University of Arizona College of Law, Tucson, Arizona J.D. - 05/1979 Arizona State University, College of Business, Tempe, Arizona B.S. - 12/1975 Bar Admissions: Arizona, 1979 U.S. District Court District of Arizona, 1979 Professional Associations: Arizona Supreme Court, Commission on Technology, Commissioner, 2015 to 2020 State Bar of Arizona, Real Property Section, Member West Maricopa County Bar Association, Director, 1990 to Present Southwest Valley Chamber of Commerce, Governm...

Tim is a shareholder, member of the Gallagher & Kennedy board of directors and head of the firm’s Tax Law practice. For over 20 years, Tim has focused his practice in all areas of federal tax law, with an emphasis on partnerships, limited liability companies, C and S corporations, real estate, international taxation, and civil tax controversy. He provides tax planning, structuring and documentation for business and individual clients, including joint ventures and tax-exempt organiza...

OVERVIEW Trevor practices in the areas of environmental and natural resources compliance, permitting, and litigation. Trevor advises clients on a variety of environmental topics, including federal, state, and local air programs; stormwater and SPCC compliance; and waste and hazardous waste management. Trevor has worked on various environmental issues in administrative appeals and in state and federal courts, as well as advised local administrative boards during appeals. Trevor also assists cl...

James R. Harrison is a lawyer recognized by Best Lawyers in the practice area of Personal Injury Litigation - Plaintiffs. James R. practices law in Phoenix, Arizona Best Lawyers has recognized James R. Harrison since 2012. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which James R. Harrison is held by other lawyers.