Harrison McAvoy advises and represents companies, business owners, and other market participants facing competition-related issues and disputes, including antitrust claims, trade secret misappropriation, data theft, misuse of intellectual property, and claims involving commercially sensitive assets and business relationships. His practice spans a range of industries, with significant experience in healthcare, pharmaceuticals, technology, financial services, and other highly competitive or regulated markets.
Harrison serves as Co-Chair of Mandelbaum Barrett’s Antitrust Practice and is a member of the Firm’s Litigation and Healthcare Practice Groups.
Harrison has more than a decade of experience litigating complex cases in federal and state courts across the country. His experience includes class actions, multidistrict proceedings, Lanham Act claims, and other complex business litigation. He has substantial experience developing litigation strategy, managing cases through motion practice, discovery, and trial preparation, and working closely with economists and other industry experts.
Harrison represents companies ranging from closely held and middle-market businesses to large national companies. He frequently works directly with business owners, executives, and in-house counsel, including those based in New Jersey. His litigation practice includes disputes with competitors, suppliers, distributors, and customers, among others. In addition to representing clients when disputes arise, he advises them on antitrust and competition issues involving business operations, competitive and commercial relationships, and strategic business decisions.
Early in his career, Harrison served as a law clerk to the Honorable Michael A. Shipp of the United States District Court for the District of New Jersey. He also interned with the New Jersey Supreme Court and the Antitrust Bureau of the Office of the New York Attorney General.
Association of the Federal Bar of New Jersey
American Bar Association
New Jersey State Bar Association
New York State Bar Association
Recent Publications:
What Aurobindo/Lannett Tells Us About the FTC’s Current Approach to Pharmaceutical M&A, Mandelbaum Barrett PC Blog (July 20, 2026)
New Jersey Launches Aggressive Crackdown on Consumer “Junk Fees”: What Businesses New to Know, Mandelbaum Barrett PC Blog (June 19, 2026)
Algorithmic Pricing and Antitrust Enforcement: Key Implications from the FTC v. Meta Decision, Hub & Spoke Blog (Dec. 1, 2025)
Algorithmic Pricing Legislation and Antitrust Pleading Standards: California’s AB 325, Hub & Spoke Blog (Oct. 10, 2025)
Pricing Algorithms and Antitrust Liability: Lessons from the In re MultiPlan Decision, Hub & Spoke Blog (July 2, 2025)
Information Exchanges and Antitrust Risk: The DOJ’s Increasing Focus on Data Intermediaries, Hub & Spoke Blog (Sept. 30, 2024)
Quoted regarding algorithmic pricing legislation in rental markets, Law360 (2025).
Interviewed regarding antitrust litigation between Compass and Zillow, HousingWire (2025).
These stories are successful case results from our attorneys. Please note that results may vary depending on your particular facts and legal circumstances.
Antitrust litigation involving payment card networks – Represented merchants in In re Payment Card Interchange Fee and Merchant Discount Antitrust Litigation, a major antitrust case concerning interchange fees and network rules.
Commercial dispute involving misuse of confidential business data – Represented an automotive parts company in LKQ Corp. v. Overall Parts Solutions, a breach of contract case involving alleged improper sharing of proprietary data and competitive information.
Monopolization claims involving digital distribution platforms – Represented a video game developer in Wolfire Games, LLC v. Valve Corp., asserting antitrust claims related to the Steam digital game distribution platform.
Generic pharmaceutical price-fixing litigation – Represented a national pharmacy chain in In re Generic Drug Pricing Antitrust Litigation, involving alleged market allocation and price fixing among drug manufacturers.
Healthcare industry antitrust dispute involving distribution practices – Represented a technology company in TraceLink, Inc. v. Healthcare Distribution Alliance, involving alleged exclusionary conduct and competition issues in the pharmaceutical distribution supply chain.
Airline industry price-fixing litigation – Represented an international airline in In re Transpacific Passenger Air Transportation Antitrust Litigation.
New Jersey
New York
U.S. District Court, District of New Jersey
U.S. District Court, Eastern District of New York
U.S. District Court, Southern District of New York
Rutgers School of Law—Newark, J.D., cum laude
Lehigh University, B.S., Finance
Recent Healthcare Litigation Win: Court Halts State Action Affecting Hospital License
April 21, 2026
We wanted to share a recent healthcare litigation result that may be of interest, particularly for clients operating in highly regulated industries or interacting with state agencies. Our healthcare litigation team recently secured emergency relief on behalf of a hospital system client in a dispute with a State agency. The matter arose after the client […]What Aurobindo/Lannett Tells Us About the FTC’s Current Approach to Pharmaceutical M&A
July 20, 2026
Although the Federal Trade Commission (“FTC”) continues to scrutinize mergers involving pharmaceutical companies, recent enforcement suggests that, in some cases, transactions presenting discrete competitive issues may still find a path to clearance through targeted divestitures. The FTC’s recent consent order permitting Aurobindo Pharma’s acquisition of Lannett Company to proceed is the latest example. The decision […]New Jersey Launches Aggressive Crackdown on Consumer “Junk Fees”: What Businesses Need to Know
June 19, 2026
New Enforcement Initiative Signals Increased Scrutiny of Consumer Pricing Practices Businesses that sell goods or services to consumers in New Jersey should take note of a significant new consumer-protection initiative announced by Governor Mikie Sherrill and New Jersey Attorney General Jennifer Davenport. Together, the Governor and Attorney General have launched a coordinated effort to identify, […]Harrison McAvoy Quoted in HousingWire on Zillow Antitrust Dispute and the Future of Real Estate Listings
June 1, 2026
Antitrust Co-Chair Harrison McAvoy was recently quoted in HousingWire‘s article, “Is Zillow a Public Utility? Attorneys Weigh In on MRED, Compass Suit,” offering his perspective on one of the most closely watched antitrust disputes currently impacting the real estate industry. The article examines Zillow’s lawsuit against Midwest Real Estate Data (MRED) and Compass, a case […]Mandelbaum Barrett’s Antitrust Practice Earns Law360 and NJLJ Spotlight
May 27, 2026
Mandelbaum Barrett PC’s newly launched Antitrust Practice is generating significant media attention, with both Law360 Pulse and the New Jersey Law Journal highlighting the firm’s strategic expansion and the growing demand for antitrust counsel amid increased enforcement and litigation activity. Together, the coverage reinforces the timely launch of the practice, led by co-chairs Harrison McAvoy […]Mandelbaum Barrett Launches Antitrust Practice to Meet Rising Counseling and Litigation Demands
May 19, 2026
As antitrust and competition law take on growing significance—driven by increased federal and state enforcement, expanding private litigation, and heightened scrutiny of pricing and transactions—Mandelbaum Barrett PC has formally launched an Antitrust Practice to help clients address these developments with sound, strategic guidance. The practice is co-chaired by Harrison McAvoy, who recently joined the Firm […]