James P. "Jim" O'Sullivan

James P. "Jim" O'Sullivan


Tiffany & Bosco P.A.

Recognized since 2013

Phoenix, Arizona

Practice Areas

Business Organizations (including LLCs and Partnerships)

Closely Held Companies and Family Businesses Law

Mergers and Acquisitions Law

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Lawyer of the Year Badge - 2024 - Closely Held Companies and Family Businesses Law Lawyer of the Year Badge - 2022 - Closely Held Companies and Family Businesses Law
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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 and acquisitions, and other agreements among business owners.

Business divorces, related fiduciary duties and other disputes among businesses are also a substantial part of Jim's practice. He has significant experience in resolving disputes among businesses and their owners, often serving in a consulting role to litigation attorneys and their clients in mediation and other forms of dispute resolution.

Jim frequently acts as counsel and as consulting counsel to other attorneys in transactions, including providing local counsel assistance to non-Arizona attorneys and their clients. Additionally, he has considerable experience as an expert witness in business law matters. Jim has been recognized by his peers with an AV rating for his legal abilities and ethics, the highest rating awarded by Martindale-Hubbell, an international attorney rating service. Jim has lectured and published extensively on business law and related ethics issues. He was one of the drafters of the revised Arizona corporate statutes, having served during the drafting process as State Bar of Arizona liaison to the Arizona Corporation Commission, and is a co-author of Arizona Corporate Practice, published by Thomson West.

Jim's community service centers on his interest in interactive education, whether as an in-classroom Junior Achievement volunteer introducing middle school students to his entrepreneur clients or interacting as a presenter with the business community and other professionals.

COURT AND BAR ADMISSIONS:
Arizona (1983)
U.S. District Court, District of Arizona
U.S. Tax Court

SELECTED PRESENTATIONS AND PUBLICATIONS:
  • Legal Issues in Buying a Company
  • A Thorough Analysis of the Unique Issues of the Limited Liability Company
  • When Business Partners Part Company
  • Done and Done-Er - The Lawyer's Odyssey to Closing...and Beyond!
  • Resolving the Business Dispute
  • Sales and Mergers of Law Firms
  • Closing a Law Practice
  • Mergers and Acquisitions of CPA Firms
  • The Ties that Bind?
  • Who is Your Client? Commentary on a New Ethics Opinion on Representing a "To-Be-Formed Company."
  • Arizona Practice Guide, a two-volume treatise published by Thomson West since 1995.
  • Revocation of Corporate Charter Raises Tax Questions," 22 Taxation for Lawyers 76, 1993, 51 Taxation for Accountants 92, 1993;
  • "Articles of Incorporation Revoked-NO BIG DEAL?," 29 Arizona Attorney 18, 1993; "COBRA-Recent Developments Shed Light on Gross Misconduct Sanctions," 28 Arizona Attorney 15, 1992;
  • "COBRA: A New Law Requires Immediate Attention to Group Health Plans," 22 Arizona Bar Journal 8, 1986, reported in Westlaw.

Location
  • Camelback Esplanade II, Seventh Floor
    2525 East Camelback Road
    Phoenix, AZ 85016-9240
Education
  • University of California Hastings College of the Law, J.D., graduated 1983
Bar Admissions
  • Arizona, State Bar of Arizona, 1983

Tiffany & Bosco P.A.
Headquarters: Phoenix, Arizona

21 The Best Lawyers in America® awards

2 Best Lawyers: Ones to Watch® in America awards

Best Law Firms Badge Visit Website View Firm Profile

Lawyer of the Year Badge - 2024 - Closely Held Companies and Family Businesses Law Lawyer of the Year Badge - 2022 - Closely Held Companies and Family Businesses Law
Named "Lawyer of the Year" by Best Lawyers® for:
  • Closely Held Companies and Family Businesses Law, Phoenix (2024)
  • Closely Held Companies and Family Businesses Law, Phoenix (2022)
Recognized in The Best Lawyers in America® 2025 for work in:
  • Business Organizations (including LLCs and Partnerships)
  • Closely Held Companies and Family Businesses Law
  • Mergers and Acquisitions Law
Special Focus:
  • Director and Officer Liability
Additional Areas of Practice:
  • Commercial Litigation
  • Corporate Law

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Beyond Business: The Personal Touch in M&A Transactions


by Justin Smulison

The stakes are always high in a business transaction because real people are often embarking on a once-in-a-lifetime event. Tiffany & Bosco M&A/Business Solutions Practice Group co-chairs Jim O’Sullivan and May Lu discuss their approach to helping business leaders make life-changing decisions and how professional partnerships strengthen their results.

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