Ryan R. Deroo

Ryan represents clients in each stage of the construction process, with a focus on mass transit systems and heavy industrial and commercial projects. His experience includes contract drafting and negotiation, procurement, project counseling, risk mitigation, dispute avoidance, and formal dispute resolution. Ryan has represented clients on projects valued from $1 million to more than $1 billion, and has handled disputes in a wide array of venues, including federal and state court, the U.S. Board of Claims, Civilian Board of Contract Appeals, Armed Services Board of Contract Appeals, and both domestic and international arbitration.

Ryan is a regular author in the field of construction litigation and arbitration. He also maintains an active pro bono practice, and currently serves as an ambassador for the Philadelphia office.

• Represented a rail car manufacturer in a dispute concerning the operation and maintenance of train sets for a significant mass transit system serving the northeast corridor.
• Represented a signaling supplier in an arbitration arising out of the retrofit of rail cars with Positive Train Control.
• Represented a rail car manufacturer in a dispute concerning the supply of train sets to a mass transit agency.
• Represented a national energy provider regarding the implementation of clean energy initiatives for the U.S. government and the associated debt service obligations over a 19+ year period.
• Represented a consortium of construction and engineering firms in international arbitration regarding the design-build of a multibillion-dollar light rail project.
• Served as trial counsel for a nationwide roof management company in a dispute concerning multiple state-funded transportations centers.
• Counseled a technology solutions provider throughout the public bidding process for new fare collections system.
• Represented an engineering firm regarding the development of a water treatment facility for one of the nation’s most contaminated superfund sites.
• Represented a general contractor regarding the construction of luxury apartment community.
• Counseled a client regarding allegations of trade secret appropriation in connection with multiple wind farm projects.
• Counseled a design-build client on delay, disruption, and differing site conditions claims related to a military project in Micronesia.
• Drafted and negotiated numerous contracts for construction industry clients (owners, developers, contractors, and subcontractors), as well as nationwide clean energy suppliers, pharmaceutical firms, biotech companies, technology service providers, manufacturing companies, and universities.
• Represented an owner of a stone quarry in claims against tenant for breach of contract arising out of tenant’s purchase of aggregate from facility.

• Best Lawyers in America®: Ones to Watch: Construction Law (2026)