A seasoned corporate attorney with two decades of experience, Mason L. Allen advises healthcare providers, entrepreneurs, and executives on complex transactions, corporate governance, and regulatory strategy.

As a Partner in the Firm’s Healthcare Practice Group, he guides clients through high-stakes negotiations and transformative business initiatives and has handled transactions across the corporate life cycle, from mergers and acquisitions and early-stage financings to public offerings, debt and equity financings, and bankruptcy restructurings.

Mason’s recent work includes representing Hudson Regional Hospital in the rescue and acquisition of Bayonne Medical Center and the creation of a four-hospital health system in Hudson County. He advised on debtor-in-possession financing, navigated multi-party negotiations, and addressed regulatory and political hurdles to preserve critical healthcare access in underserved communities. He also represented a specialty care practice in a joint venture and partial acquisition by RWJBarnabas Health, the system’s largest investment in an independent physician group to date.

Previously, Mason served as General Counsel of RCS Capital, a NYSE-listed financial services company in the alternative investments sector and owner of the second largest network of independent broker-dealers in the U.S., where he oversaw its Chapter 11 restructuring. He has also advised multi-state healthcare, veterinary, and cannabis companies on capital-raising, governance, and strategic transactions, as well as facilitated IPOs for U.S.-based medical device and pharmaceutical companies.

Before practicing law, Mason worked as a healthcare management consultant, advising hospitals and health systems on patient throughput, claims processing, and revenue enhancement. His consultancy highlights include designing improved patient flow for Hackensack University Medical Center’s outpatient oncology center and assisting Saint Joseph’s Medical Center in Medicaid revenue recovery and appeals.

Mason earned his J.D., cum laude, from Brooklyn Law School, where he served as Executive Notes and Comments Editor of the Brooklyn Journal of International Law. He holds a B.A. in History from Dartmouth College.

  • New Jersey

  • Dartmouth College, B.A. in History
  • Brooklyn Law School, J.D., Cum Laude

Mandelbaum Barrett PC Represents Hudson Regional Hospital in Successful Acquisition of CarePoint Health System Through Chapter 11 Reorganization

April 15, 2025

Mandelbaum Barrett PC’s healthcare and bankruptcy teams successfully represent affiliates of Hudson Regional Hospital (“Hudson”) in the acquisition of CarePoint Health System hospitals and the creation of a new healthcare system pursuant to a confirmed Chapter 11 Reorganization Plan in the bankruptcy cases of CarePoint Health System and affiliated medical practices (“CarePoint”) in Delaware (Case […]

Mandelbaum Barrett PC’s Healthcare Practice Group Successfully Represents Prestigious Oncology and Hematology Practice in Landmark Joint Venture with Leading New Jersey Hospital System

January 16, 2025

Mandelbaum Barrett PC today announced its Healthcare Practice Group’s successful representation of a highly esteemed Morris County multi-physician oncology and hematology medical practice in a high-value joint venture with one of New Jersey’s largest and most prominent hospital systems. The transaction, which navigated a sophisticated blend of legal, regulatory, and operational considerations, highlights the Mandelbaum Barrett […]

New York Legal Update

January 29, 2026

We hope that 2026 is off to a fantastic start for you and your team! As we kick off the new year, we’re excited to share the impressive New York–related wins and milestones that Mandelbaum Barrett PC achieved from June through the end of 2025. From high-profile litigation and M&A transactions to regulatory developments and […]

Mandelbaum Barrett PC’s Healthcare & Bankruptcy teams were awarded the Restructuring Deal of the Year ($100 Million to $1.0 Billion) at the 24th Annual M&A Advisor Awards

November 21, 2025

We are thrilled to share that our Healthcare & Bankruptcy teams were awarded the Restructuring Deal of the Year ($100 Million to $1.0 Billion) at the 24th Annual M&A Advisor Awards. The M&A Advisor Awards is an industry event organized by The M&A Advisor, which recognizes excellence in mergers & acquisitions, restructuring, financing, firms and deal […]