Advising on a wide range of transactional and regulatory matters, Rebecca (Becca) Waltuch counsels hospitals, health systems, accountable care organizations (ACOs) and other healthcare clients through complex operational and contracting matters, including multi-state physician practice acquisitions, joint ventures and provider employment agreements. Becca advises clients on structuring transactions and navigating any health regulatory issues that arise in such transactions. Becca is also experienced in addressing the legal issues that arise in establishing or restructuring physician network affiliations, value-based payment models and managed-care contracting.
- Serves as the lead lawyer for a large hospital system in the sale and acquisition of physician practices.
- Counsels on all regulatory and transactional aspects of multiple community hospital acquisitions and strategic affiliation deals in the for-profit and nonprofit sectors.
- Advised a large health system on the formation and operation of a Next Gen ACO, a MSSP ACO and a Medicaid ACO, including the preparation of certain fraud and abuse waivers.
- Best Lawyers in America, Healthcare Law, 2023-2025
- American Health Lawyers Association
- Diversity and Inclusion Committee and Gender Diversity Subcommittee at McDermott
- Northeastern University School of Law, JD
- Tufts University, MPH
- Barnard College, BA
- Massachusetts
- New Jersey
- New York

Sarah E. Walters
Sarah Walters is a former federal prosecutor and experienced trial lawyer who focuses her practice on white-collar criminal defense, regulatory enforcement and compliance matters and complex civil litigation. In addition to both criminal and civil trial work, Sarah has substantial experience conducting internal investigations and representing clients in securities, healthcare and other government enforcement matters. She also assists companies in developing compliance policies and programs.
Government and Internal Investigations
- Defends a broad spectrum of organizations, including healthcare providers and systems, government contractors and publicly traded companies, in connection with civil and criminal government investigations and related litigation
- Represents executive of major publicly traded company in FCPA investigation
- Represents government contractor in False Claims Act investigation related to compliance with cyber security requirements
- The Best Lawyers in America, Criminal Defense: White-Collar and Litigation – Securities, 2019 to 2024
- The Best Lawyers in America, Lawyer of the Year, Criminal Defense: White Collar, Boston, 2023
- The Best Lawyers in America, Lawyer of the Year,Litigation – Intellectual Property, Boston, 2024
- Chambers USA, Litigation: White-Collar Crime & Government Investigations, 2021 to 2023
- Legal 500 US, 2019
- Boston College Law School, JD, magna cum laude, Order of the Coif 1997
- University of Pennsylvania, BA, cum laude
- Massachusetts
- US Court of Appeals for the First Circuit
- US Court of Appeals for the Fourth Circuit
- US District Court for the District of Massachusetts

Jerome B. Tichner
Jerome (Jerry) B. Tichner focuses his practice on representing hospitals and health systems in transactional matters, including mergers, acquisitions, joint ventures, affiliations and dispositions. He also devotes a significant portion of his practice to representing private equity firms and their platform companies with respect to the acquisition and divestiture of health care-related companies and assets. In recent years, Jerry has led or played a leading role in transactions involving the purchase, sale or affiliation of more than 35 hospitals nationally.
- Representation of a non-profit Catholic health system with respect to its sale of six hospitals and affiliated assets to a private-equity funded for profit health care system and the subsequent representation of the for-profit system in its acquisition of multiple other hospitals
- Representation of multiple private equity clients with respect to their respective acquisition of assets of, and ownership interests in, sub-acute health care providers (e.g., behavioral health providers, hospice providers) in multiple states
- Representation of private equity clients with respect to health care issues related to credit/financing agreement
- The Best Lawyers in America, Healthcare Law, Boston, 2019 to 2024
- Chambers USA, 2013 to 2023
- The Legal 500 US, 2015
- American Health Lawyers Association, National Pro Bono Champion, 2012 to 2016
- Families for Depression Awareness, board chair
- Boston Bar Association, Health Law Communications Committee, co-chair (2013 to 2015)
- Boston University School of Law, JD
- University of Rochester, BA
- Massachusetts

Amy C. Pimentel
Amy C. Pimentel (CIPM) advises clients on the legal, regulatory, and governance challenges that arise at the intersection of privacy, cybersecurity, and technology. She helps organizations navigate evolving global requirements while developing practical strategies that enable innovation, manage risk, and support business growth. Amy is particularly skilled at translating complex legal and regulatory frameworks into operational solutions that work across jurisdictions, products, and business functions.
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- Developed and implemented global compliance programs for numerous US and international organizations, including advice on GDPR, HIPAA, CCPA/CPRA (and new state privacy laws in Virginia and Colorado), data mapping, data transfer mechanisms, privacy notices, consent mechanisms, data subject and consumer rights, data security assessments, incident response preparation, program governance (including appointment of Privacy Officers and EU Representatives) and employee training
- Advised big tech companies on development of new technologies and consumer products, including software-as-a-service offerings, wearable fitness devices, vaccine passports, remote care platforms, automotive infotainment systems and mobile applications
- Managed the development of a global data privacy assessment and data mapping of a multibillion-dollar food service company to evaluate the process through which it collects, stores, protects, shares and manages information in more than 100 countries
- Massachusetts Lawyers Weekly, Go To Cybersecurity & Data Privacy Lawyer, 2026
- Law.com New England Legal Awards, New Leaders in the Law, 2024
- Super Lawyers, Rising Star, 2018-2025
- Legal 500 US, Recommended Lawyer, 2025
- Legal 500 US, Rising Star, 2020
- Boston Bar Association
- National Asian Pacific American Bar Association, Data Security and Privacy Committee Co-Chair
- International Association of Privacy Professionals
- Northeastern University School of Law, JD
- Duke University, BA
- Massachusetts

Matthew J. Perreault
Matt Perreault advises healthcare organizations on complex transactions, sophisticated managed care arrangements, and related fraud and abuse matters. He represents accountable care organizations (ACOs); diverse provider, risk intermediary, care management and provider enablement organizations; health plans; and investors on a wide range of value-based care agreements, including shared savings, bundled payments, downside risk and capitation arrangements.
- Represented a leading health solutions company in the sale of its Medicare Shared Savings Program (MSSP) and Primary Care Flex ACOs
- Drafted a value-based participating provider agreement template for a national Medicare Advantage organization
- Negotiated settlement agreements with large provider organizations on behalf of an ACO exiting the ACO REACH Model
- Best Lawyers in America, Health Care Law, 2026-2027
- Legal 500 US, Recommended, 2025
- American Health Lawyers Association
- University of North Carolina at Chapel Hill, JD
- Bates College, BA
- Massachusetts

Mark W. Pearlstein
Mark W. Pearlstein concentrates his practice on white-collar criminal defense, the defense of actions brought by the US Securities and Exchange Commission, complex commercial litigation, arbitration and internal investigations. Previously, he was the partner-in-charge of the Boston office and served as head of the Boston Trial Department. Mark is also a member of the Firm-wide Management Committee.
- Represented the former chief investment officer of State Street Global Advisers in a suit brought by the Securities and Exchange Commission; following a three-week trial, the client was exonerated completely
- Appointed by Massachusetts Governor to conduct an independent investigation of a state-run long-term care facility. The ensuing report and its recommendations appear to be contributing to needed improvements at the facility and in its oversight
- Successfully tried multiple healthcare fraud cases
- Successfully tried multiple criminal tax cases
- Chambers USA, Band 1 in Litigation: White-Collar Crime & Government Investigations, 2004-2026
- Best Lawyers in America, Commercial Litigation (2006-2027), Criminal Defense: White Collar (2007-2027), Bet-the-Company Litigation (2010-2027), Healthcare Litigation, 2023-2027
- Best Lawyers in America: Boston Criminal Defense: White-Collar “Lawyer of the Year,” 2018, 2021 and 2023
- Legal 500 US, 2019, 2021, 2023 and 2024
- Massachusetts Lawyers Weekly, Go To Business Litigation Lawyer, 2022
- Harvard Law School, JD, cum laude
- University of Michigan, AB, with highest distinction
- Massachusetts
- US Court of Appeals for the First Circuit
- US Court of Appeals for the District of Columbia Circuit
- US Tax Court
- US District Court for the District of Massachusetts

Dana M. McSherry
Dana McSherry is the Boston lead of McDermott Will & Schulte’s Litigation Practice Group and co-leads the firm’s False Claims Act (FCA) practice. She advises healthcare and life sciences companies in criminal and civil government enforcement matters and in related civil litigation, including civil False Claims Act (FCA) litigation. Dana guides clients through all aspects of civil and criminal investigations relating to Medicare and Medicaid billing and other government contracting issues, including negotiating with the government and managing clients’ responses to civil investigative demands and large-scale investigative subpoenas. She also assists clients in conducting internal investigations and counsels clients across the healthcare industry on compliance and risk management issues.
- Representing pharmaceutical company in state and federal investigations relating to patient support services
- Represented pharmaceutical company in industry-wide investigation by the US Attorney’s Office in Massachusetts and the DOJ into donations to charitable assistance foundations that provide financial assistance to Medicare patients
- Successfully defended a pharmacist charged with RICO, mail fraud, and Food, Drug and Cosmetics Act violations; following a two-month trial, the client was acquitted of all charges
- Best Lawyers in America, Healthcare Law (2023-2027), Criminal Defense: White-Collar, Litigation – Health Care, 2026-2027
- Thomson Reuters, Stand-out Lawyer – independently rated lawyers, 2025-2026
- Chambers USA, Litigation: White-Collar Crime & Government Investigations, 2025-2026
- Boston Bar Association
- Women’s Bar Association
- Boston College Law School, JD
- University of Notre Dame, BA, magna cum laude
- Massachusetts
- US District Court for the District of Massachusetts

Laura McLane
Laura McLane co-leads McDermott’s white-collar and government investigations practice as well as the Firm’s False Claims Act (FCA) practice, and is a nationally renowned FCA litigator. For over 25 years, Laura has defended companies touching all aspects of the healthcare and life sciences industries in government investigations, qui tam litigation under the FCA, and related matters. Clients call Laura “an exquisite lawyer, very smart and incisive,” a “fierce advocate for her clients,” and “simply a brilliant attorney with a tremendous ability to navigate difficult circumstances.” (Chambers USA). Laura was named Boston’s Lawyer of Year in Healthcare Litigation by Best Lawyers in America for 2025-2026.
- Represented the defendant in the groundbreaking Escobar case during which Laura obtained a writ of certiorari from the United States Supreme Court, after which the Court unanimously reversed an adverse decision of the court of appeals in the most important FCA decision in decades
- Defends healthcare providers and other healthcare entities spanning all sectors, such as hospitals, ambulatory surgery centers, laboratories, urgent care, emergency medicine, telemedicine, dentistry, dialysis, behavioral health, as well as medical device manufacturers, pharmaceutical manufacturers, healthcare investors, Medicare Advantage brokers, and others in government investigations and qui tam litigation under the False Claims Act and related statutes, including the Anti-Kickback Statute and the Stark Law
- Successfully advocated on behalf of numerous clients in persuading the government to decline to intervene or pursue claims under the FCA and related statutes
- Chambers USA, Litigation: White-Collar Crime & Government Investigations, 2021-2026 and Nationwide: False Claims Act, 2026
- Legal 500 US, 2020-2025
- Best Lawyers in America, Lawyer of the Year: Litigation – Healthcare, 2025-2026
- Best Lawyers in America, Healthcare Law, Litigation – Healthcare (2019-2027), Criminal Defense: White-Collar, 2027
- Who’s Who Legal: Healthcare, 2021
- Boston University School of Law, JD, cum laude
- Emory University, BA
- Massachusetts
- Supreme Court of the United States
- US Court of Appeals for the First Circuit
- US Court of Appeals for the Second Circuit
- US Court of Appeals for the Fifth Circuit
- US District Court for the District of Massachusetts
- US Court of Appeals for the Ninth Circuit
- US Court of Appeals for the Eleventh Circuit
- US District Court for the District of Colorado

Drew Elizabeth McCormick
Drew Elizabeth McCormick is a seasoned healthcare regulatory lawyer whose practice spans the full spectrum of federal and state regulatory oversight of the health industry. She is particularly known for her sophisticated command of fraud and abuse laws — including the Anti-Kickback Statute, the Stark Law, the False Claims Act, and state fraud and abuse analogues — as well as Medicare and Medicaid program rules, reimbursement rules and policy, and enrollment, licensing, and certification requirements. She also has extensive experience in various emerging areas of healthcare regulation, including surprise billing regulation and state transaction notice laws.
- Best Lawyers in America, HealthCare Law, 2027
- Best Lawyers: Ones to Watch in America, Healthcare Law, 2024-2025
- American Health Lawyers Association
- Illinois Association of Healthcare Attorneys
- Loyola University Chicago School of Law, JD, magna cum laude
- Loyola University Chicago, MA, magna cum laude
- University of Connecticut, BA, cum laude
- Illinois
- Massachusetts

Andrew C. Liazos
Advises boards and senior executives on multidisciplinary executive compensation and employee benefits matters
Counsels clients on compensation strategy, governance, and regulatory compliance
Represents clients in executive compensation and employee benefits litigation
Guides organizations through complex compensation and benefits matters
Andrew C. Liazos is the global head of the Employee Benefits & Executive Compensation Practice Group, with more than 30 years at the firm.
Governance and board/special committee representations
- Advised the Special Committee of Tesla, Inc. in designing and negotiating the $1 trillion equity package to Elon Musk that was overwhelmingly approved by stockholders and enabled Musk to vote shares prior to the award becoming taxable
- Retained as counsel to the audit committee of a Fortune 500 company to evaluate and advise on rights to recover compensation under its clawback policy, including statute of limitation, estoppel, and indemnification considerations
- Represented the special committee of a New York Stock Exchange company in connection with allegations of board self-dealing and in connection with Delaware Court of Chancery litigation
- Retained as counsel by the compensation committee of several public companies in connection with sensitive executive compensation matters, including hiring and employment terminations, setting director compensation, addressing change in control-related disputes, and adopting discretionary clawback policies beyond minimum requirements under the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010
- Retained as counsel by the audit committee of a Fortune 500 company to address whistleblower claims alleging improper securities disclosure and tax reporting of corporate aircraft usage
- Retained by a board of directors to conduct compliance review of tax-qualified plans after allegations of wrongdoing by plan participants and resolve a related investigation by the US Department of Labor (DOL)
- The Best Lawyers in America, Lawyer of the Year in Boston: Employee Benefits (ERISA) Law, 2027
- The Best Lawyers in America, Employee Benefits (ERISA) Law, 2011-2027
- Chambers USA, Band 1 in Employee Benefits & Executive Compensation, 2006-2026
- Legal 500 US, Leading Partner in Employee Benefits, Executive Compensation and Retirement Plans: Design, 2025
- Legal 500 US, Recommended, 2007-2025
- McDermott Will & Schulte Management Committee, member
- American Bar Foundation, fellow
- American Law Institute, Symposium on Executive Compensation, co-chair
- American College of Employee Benefits Counsel, fellow
- ERISA Industry Committee, Advisory Council Member
- Suffolk University Law School, JD, Tax, cum laude
- University of Massachusetts Amherst, BS, cum laude
- Massachusetts
- Maine
- New York
- Supreme Court of the United States
- US Tax Court