About Justin N. Leonelli
Justin N. Leonelli is a projects and infrastructure attorney who helps owners, developers, contractors, design professionals, manufacturers, suppliers, and other businesses navigate their most important projects, contracts, and disputes.
Recognized by Chambers USA, Justin serves as both project counsel and dispute counsel on some of the most sophisticated industrial, energy, manufacturing, and commercial infrastructure matters across the United States and internationally. Clients rely on him to provide practical, business-oriented advice throughout the project lifecycle, from contract strategy and risk allocation through project execution, claims management, and dispute resolution.
Justin’s practice spans the full spectrum of project delivery and infrastructure development. He regularly advises on the negotiation and administration of engineering, procurement, and construction (“EPC”); design-build; engineering; procurement; construction management; supply chain; and other complex commercial agreements. When disputes arise, he represents clients in litigation, arbitration, mediation, and other forms of dispute resolution involving delay, disruption, defective work, productivity impacts, scope disputes, payment disputes, warranty issues, and major contract claims.
Bloomberg Law has recognized Justin’s practice for “bringing continuity from contract negotiation through execution and dispute resolution.” Among other areas, his experience includes matters involving:
- Energy and Power: Power plants, pipelines, oil refineries, coal mines, natural gas transmission and distribution facilities, solar fields, wind farms, battery storage facilities, and other conventional, renewable, and emerging energy assets;
- Industrial and Manufacturing: Manufacturing plants, steel mills, chemical facilities, refineries, and industrial processing facilities;
- Technology and Mission-Critical Facilities: Data centers, cloud and artificial intelligence infrastructure, telecommunications infrastructure, defense-related facilities, and other mission-critical assets;
- Transportation and Public Infrastructure: Aviation, rail, roadway, and related public works projects; and
- Commercial and Institutional Development: High-end commercial, retail, mixed-use, higher education and university projects, and other institutional developments.
In addition to his projects and infrastructure practice, Justin advises clients on complex commercial disputes and supply-chain matters. He has substantial experience negotiating and resolving disputes involving domestic and international supply agreements, manufacturing contracts, equipment procurement, and large-scale commercial transactions. He regularly handles matters involving issues under both the Uniform Commercial Code (“UCC”) and the United Nations Convention on Contracts for the International Sale of Goods (“CISG”).
Justin’s clients range from Fortune 500 companies and global engineering and construction firms to project owners, developers, manufacturers, design professionals, and suppliers. He is particularly valued for his work ethic, creative approach, and ability to bridge the gap between legal strategy and practical business objectives.
Before joining Blank Rome, Justin practiced at two Am Law 50 firms, where he developed a national practice focused on construction, infrastructure, energy, and high-stakes commercial disputes.
Outside the Firm
Justin grew up in Youngstown, Ohio, where he attended Cardinal Mooney High School. Outside of work, he enjoys spending time with his wife and kids.
A description of the standard or methodology on which the accolades are based can be found here.
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Experience
Select Disputes
- Represented a utility-scale battery energy storage system manufacturer in a dispute arising from the development of a California microgrid and battery energy storage project involving alleged project delays, performance deficiencies, remediation costs, liquidated damages, warranty claims, and completion-related issues.
- Represented an international battery energy storage system manufacturer and developer in an AAA arbitration involving five utility-scale battery energy storage projects in California, concerning performance guarantees, warranty obligations, alleged equipment defects, and claims exceeding $20 million.
- Represented supplier and subcontractor of fire protection, life safety, and commercial security systems in numerous construction disputes involving nonpayment, retainage, mechanic’s liens, payment bonds, and related subcontract claims.
- Represented a specialty building envelope contractor in various disputes involving payment and lien claims, supplier defaults, material escalation, project delays, and other subcontract and supply-chain issues.
- Represented a global light rail and transportation manufacturer in a dispute arising from the modernization of an urban light rail transit system.
- Represented a global engineering firm in dispute arising from the design and engineering of a first-of-its-kind industrial chemical processing facility.
- Represented a diesel manufacturer in an ICC arbitration in New York, brought with client’s consortium partner and co-claimant against the project owner of five separate diesel-fired power plants in the Republic of Chile. The claims relate to a dispute over project delays and breach of five EPC contracts.
- Represented a synthetic rubber manufacturer in a $40 million breach of contract dispute against a manufacturer concerning the supply a defective O-ring seals that diminished production at the client’s butyl synthetic rubber production facility in Canada.
- Represented the owner of the largest commercial building in Butler County, Pennsylvania, in relation to its defective construction and design claims against trade contractors, the construction manager, and the engineer of record. This matter involved construction and design defects to the façade of the building, leading to millions of dollars in repair costs and related damages.
- Represented a Taiwanese civil/structural subcontractor in connection with disputes arising out of the construction of a new 500-megawatt gas-fired power plant in Taiwan. The seat was Taipei, and the arbitration was conducted under the rules of the Hong Kong International Arbitration Centre. The applicable law was Taiwanese law, and the language of the arbitration was English.
- Represented a global light rail and transportation manufacturer in relation to the failure of certain guideway ride plates located at the Phoenix Sky Harbor International Airport.
- Represented a global wind turbine manufacturer and supplier in relation to the construction of several wind farm projects involving claims for delay, defects, force majeure, and changes, and defended against liquidated damages claims.
- Represented an international EPC contractor in connection with claims arising out of the construction of the largest oil refinery in South America. Claims and cross-claims exceeded $2.2 billion in one of the largest ICC arbitrations on record.
Select Transactions
- Counsel for a leading battery energy storage system (“BESS”) manufacturer and developer in connection with a utility-scale BESS project for a major Virginia utility.
- Counsel for a leading BESS manufacturer and developer in connection with a multi-site BESS project utilizing a full-wrap EPC delivery structure.
- Counsel for a global transportation asset leasing and services company in connection with the development of a multimillion-dollar industrial gas flare system at its California rail facility.
- Counsel for an influencer-founded luxury cosmetics and skincare company in connection with the development of its New York City headquarters.
- Counsel for an influencer-founded women’s activewear brand in connection with the development of its California and New York City flagship retail stores.
- Counsel for a turbo-machinery manufacturer in relation to the construction of its manufacturing facilities throughout the United States.
- Counsel for a large-scale manufacturer in connection with the development of its U.S.-based manufacturing facilities utilizing a full-wrap EPC delivery structure.
A description of the standard or methodology on which the accolades are based can be found here.
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News & Views
Events & Webinars / Speaking Engagement
Navigating Construction Disputes: Practical Strategies from Claim to ResolutionNovember 10, 2026
Honors & Awards / Ranking
Chambers USA 2026 Recognizes Blank Rome Attorneys and PracticesJune 4, 2026
Events & Webinars / Speaking Engagement
Justin N. Leonelli: Noteworthy Speaking EngagementsThrough to 2026
A description of the standard or methodology on which the accolades are based can be found here.
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Recognitions
- 2026, Construction Law, listed in Chambers USA
- Allegheny County Council Proclamation
- CALI Excellence for the Future Award, Legal Research & Writing
- CALI Excellence for the Future Award, Advanced Legal Writing: Writing in Law Practice
- Best Appellate Brief in Academic Mock Appeal
A description of the standard or methodology on which the accolades are based can be found here.
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Memberships
- Society of Construction Law - North America
- Allegheny County Bar Association
Professional Activities
- Society of Construction Law – North America, Regional Director – Delaware Valley Region
- New Century Careers, Director (2017–2021)
A description of the standard or methodology on which the accolades are based can be found here.
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Bar Admissions
- Pennsylvania
Court Admissions
- U.S. District Court - Middle District of Pennsylvania
- U.S. District Court - Western District of Pennsylvania
Education
- Duquesne University, BA
- Duquesne University School of Law, JD
A description of the standard or methodology on which the accolades are based can be found here.
