Randy Mastro, a seasoned litigator and former First Deputy Mayor of New York City, has joined Dechert LLP as co-chair of its securities and complex litigation practice. Mastro brings over four decades of trial, appellate, and investigative experience to the firm, where he will focus on high-stakes disputes, multi-jurisdictional investigations, and regulatory enforcement actions for corporate clients.
Prior to this appointment, Mastro served as First Deputy Mayor under Mayor Eric Adams from March to December 2025. In this role, he oversaw key initiatives, including housing plans, school technology programs, and climate resiliency efforts. His tenure concluded with his resignation ahead of the City Hall transition to Mayor-elect Zohran Mamdani. ([ny1.com](https://ny1.com/nyc/all-boroughs/politics/2025/12/08/first-deputy-mayor-randy-mastro-resigns-ahead-of-city-hall-transition?utm_source=openai))
Mastro’s extensive legal career includes serving as Deputy Mayor for Operations under Mayor Rudy Giuliani and as a federal prosecutor in the Southern District of New York. He has represented Fortune 500 companies, boards, senior executives, and financial institutions in complex litigation and white-collar criminal matters. ([streetinsider.com](https://www.streetinsider.com/Press%2BReleases/Dechert%2BStrengthens%2BLitigation%2BBench%2Bwith%2BPreeminent%2BNY%2BTrial%2BAttorney%2BRandy%2BMastro/25855538.html?utm_source=openai))
Dechert’s co-chair, Mark Thierfelder, expressed enthusiasm about Mastro’s addition, stating, “Randy is one of the premier litigators and government enforcement practitioners in the country. His proven track record in complex investigations and high-profile trials will be invaluable to our clients.” ([streetinsider.com](https://www.streetinsider.com/Press%2BReleases/Dechert%2BStrengthens%2BLitigation%2BBench%2Bwith%2BPreeminent%2BNY%2BTrial%2BAttorney%2BRandy%2BMastro/25855538.html?utm_source=openai))
Mastro himself remarked, “I am thrilled to be joining Dechert, a firm I have long admired and seen ascend to become a global powerhouse today. I look forward to helping the firm grow its complex commercial litigation practice and serve our clients with distinction.” ([streetinsider.com](https://www.streetinsider.com/Press%2BReleases/Dechert%2BStrengthens%2BLitigation%2BBench%2Bwith%2BPreeminent%2BNY%2BTrial%2BAttorney%2BRandy%2BMastro/25855538.html?utm_source=openai))
Dechert’s litigation practice comprises over 225 lawyers worldwide, handling significant domestic and multi-jurisdictional disputes. The firm continues to strengthen its bench, recently elevating 17 attorneys to partnership, reflecting its commitment to growth and excellence. ([dechert.com](https://www.dechert.com/knowledge/news/2025/12/dechert-elevates-17-attorneys-to-partnership.html?utm_source=openai))