Andrea T. Best advises clients on insurance regulatory compliance throughout the United States. She works with insurers, reinsurers, intermediaries, brokers, trade associations and others in the insurance market.
- Providing regulatory and structuring advice on cross-border insurance and reinsurance transactions involving the US, EU, Bermuda and other jurisdictions
- Handling insurer applications for surplus lines approval to NAIC and individual states
- Providing US regulatory advice on acquisition/change of control of insurers and brokers
- Business Insurance 2020 Women to Watch
- Pro Bono Recognition List of England and Wales, 2026
- New Jersey Bar Association, member
- New York Bar Association, member
- Georgetown University Law Center, JD
- Columbia University, BA
- England and Wales
- New Jersey
- New York
- English
- Hungarian

Thomas M. Dawson
Thomas M. Dawson represents US and non-US re/insurers, brokers and intermediaries on regulatory, licensing, compliance, product development, and corporate matters.
- Advising non-US insurers seeking to establish US holding companies and form/acquire US brokers and underwriting agencies
- Advised large family office fund in connection with acquiring control of a tire retailer that owns a significant US-domiciled captive insurer
- Advised a large US property and casualty insurance group in a complex process to convert an admitted insurer into a surplus lines insurer, transfer admitted risks to affiliated admitted insurers and retain risks eligible to be written on a surplus lines basis
- The Best Lawyers in America, Insurance Law, 2021-2022 and 2024-2027
- Chambers USA, Insurance: Transactional & Regulatory, 2016-2026
- Legal 500 US, Recommended, 2022-2025
- London School of Economics and Political Science, LLM
- St. John's University School of Law, JD
- Colgate University, AB
- New York

Dan Brown
Dan Brown represents insurance companies, start-ups, agents, brokers and other stakeholders in all aspects of the admitted, exempt and surplus lines insurance markets in the United States.
Legal 500 US, 2022
- Stanford Law School, JD, summa cum laude
- Portland State University, BS
- California
- US Court of Appeals for the Ninth Circuit
- US District Court for the District of Hawaii

Michael R. Halsband
Advises insurance and reinsurance clients on M&A, new company formation, financings, capital raises, and new product development
Counsels InsurTech startups on formation and transactional and regulatory matters
Structures complex reinsurance transactions, insurance-linked securities, and distressed portfolio run-off matters
Leverages his executive and investment banking experience at leading global investment banks and reinsurance groups to provide practical business and legal guidance
Michael R. Halsband has more than 35 years of leadership experience in the insurance and reinsurance industry, including in investment banking and capital markets. He is the global leader of the firm’s Insurance Transactions and Regulation Group.
- Advised ALPS Insurance, the nation’s leader in insurance solutions for law firms, in its acquisition of the Ohio Bar Liability Insurance Company, a leading provider of professional liability insurance for attorneys in Ohio
- Represented the largest group of non-founder equity owners of Atlantic Group, the leading independent US-based transaction liability insurance brokerage, in Atlantic Group’s sale to Howden, the global UK-based insurance broker
- Advised MGG Investment Group, a direct lending investment firm, in connection with the signing of a definitive agreement for Conning & Company, Generali Investments’ wholly owned subsidiary, to acquire a majority stake in MGG for $320 million
- Represented General Atlantic in its $179 million growth investment in Gravie, a health InsurTech that offers low-cost employer-sponsored health benefits packages
- Chambers USA, Insurance: Transactional & Regulatory, Band 2, 2020-2026
- Legal 500 US, Leading Lawyer, 2024-2025
- Legal 500 US, Recommended, 2021-2023
- Rutgers Law School, JD
- Muhlenberg College, BA
- New York
- US District Court for the Eastern District of New York
- US District Court for the Southern District of New York
- English

H. Michael Byrne
Advises US and international brokers, MGAs, insurers, reinsurers, investors, and technology companies on complex insurance transactions and regulation
Handles regulatory approvals and due diligence for M&A and affiliate transactions, and the formation, licensing, and structuring of business operations
Negotiates distribution, MGA, and other administration agreements and develops and obtains approvals for novel insurance products
Counsels clients on InsurTech, excess and surplus lines, and the intersection of healthcare and state insurance regulation
H. Michael (Mike) Byrne has extensive experience in complex insurance transactions, regulation, and InsurTech matters. He is vice chair of the firm’s insurance transactions and regulation practice and co-leader of its InsurTech practice.
- Represented Aon plc, a global insurance broker, on insurance commercial and regulatory matters in several M&A transactions, including their $13.4 billion acquisition of NFP, a retail insurance, benefits, and wealth management broker and advisor
- Represented Allianz X, the strategic investment arm of the Allianz Group, on insurance commercial and regulatory matters in a strategic equity investment in data-powered managing general agent Coterie Insurance
- Represented Arthur J. Gallagher & Co., one of the world’s largest insurance brokerage, risk management, and consulting firms, in the acquisition of Bremer Insurance Agencies, a subsidiary of Old National Bancorp
- Represented Sayata, an AI-enabled digital distribution marketplace and agency operations for commercial insurance, in its sale to Penn-America Underwriters, a subsidiary of Global Indemnity Group, a publicly listed holding company for property and casualty insurance-related businesses
- Represented a private investment and direct lending firm in an investment in a reciprocal inter-insurance exchange
- Best Lawyers in America, Insurance Law (2025-2027), Mergers and Acquisitions Law, 2027
- Chambers USA,Insurance: Transactional & Regulatory (Nationwide), 2025-2026; Band 2, Insurance: Transactional & Regulatory (New York), 2017-2026
- Legal 500 US, Recommended, 2021-2025
- NAPSLO Legislative Advocacy Award, 2013
- New Jersey Surplus Lines Association Person of the Year Award, 2019
- McDermott Will & Schulte, Insurance Transactions and Regulation Practice Group, vice chair
- McDermott Will & Schulte, InsurTech Practice Group, co-leader
- WSIA/NAPSLO, Legislative Committee, member, 2005-present
- Insurance Industry Charitable Foundation, Northeast Division, former board of directors and grants committee member, 2012-2019
- Rutgers Law School, JD, cum laude
- Rutgers University, BA
- New Jersey
- New York
- Pennsylvania
- English
Dr. Christian Driessen-Rolf
Dr. Christian Driessen-Rolf advises national and international companies, including strategic and private investors, on all issues of individual and collective labor law. He focuses his practice on employment, labor, civil and commercial law, executive compensation and benefits schemes, as well as compliance advice. He also has extensive experience in employment law-related matters in M&A and private equity transactions, management investment restructuring scenarios and complex business litigation. Another focus includes advising top executives and handling management liability lawsuits.
Christian Driessen-Rolf provides day-to-day advice and analyzes employment-law aspects of corporate transactions, mergers, carve-outs, restructurings and realignment of businesses and post-deal reorganizations. In addition, he has significant experience in negotiating with works councils and trade unions.
He frequently publishes articles in the business press and on social medial and is a speaker at various conferences.
Prior to joining McDermott, Christian worked at a leading German law firm and was Head of German Employment Law at an international US law firm.
Christian advised:
- Main Capital on the Acquisition of a Majority Stake in Buchner & Camp Partner
- Gigaset in the realignment of the Gigaset Group
- Hudson’s Bay Company on the acquisition and sale of Galeria Kaufhof*
- Sparda-Datenverarbeitung in the data center outsourcing to T Systems*
*Matter handled prior to joining McDermott
- Handelsblatt/Best Lawyers™, Germany: Employee Benefits Law and Labor and Employment Law, 2020-2027
- The Legal 500 EMEA, Recommended, Germany: Employment Law, 2024
- The Legal 500 EMEA, Recommended, Germany: Employment Law (“Dr. Christian Rolf is an excellent lawyer. He always has his client’s interests in mind – as well as the big picture. As a clever strategist, he always has the right advice at the right time.”), 2023
- The Legal 500 EMEA, Recommended, Germany: Employment Law (“Dr. Christian Rolf is an enrichment as a consultant on labor law issues, especially at the interface with corporate law. Clear in the matter and the content management, straightforward in the coordination and communication – he always shows practical solutions as an alternative to legal (im)possibility.”), 2019-2022
- Frankfurt Bar Association
- Society for Data Privacy and Data Security
- Germany
- English
- German

Frank Müller
Advises fund managers on the structuring and formation of investment funds.
Provides regulatory advice to fund and asset managers as well as institutional investors.
Establishes and comprehensively advises fund management companies on regulatory matters and communication with supervisory authorities.
Advises asset managers on real estate transactions and ongoing asset. management
For more than 20 years, Frank Müller has been advising fund initiators, institutional investors, and asset managers across their entire value chain. He advises institutional investors on their fund investments. He has extensive experience in the establishment of fund management companies as well as in providing regulatory advice, including communication with supervisory authorities.
Frank Müller advises on the structuring of investment funds with a particular focus on alternative investments. He has broad experience in the formation of open-ended and closed-ended funds, retail and special funds, club deals, fund of funds and other structures. He provides advice throughout the entire investment lifecycle, from initial investment to exit and liquidation.
In addition, Frank Müller advises asset managers on real estate transactions, both on the buy-side and sell-side, as well as on ongoing asset management matters.
Clients value Frank Müller for his decades of experience and strong network within the investment fund and real estate industries, as well as for his pragmatic approach to legal advice. They seek his counsel not only on legal matters but also on strategic questions in complex projects and situations. Owing to his deep understanding of the value chain and both the legal and commercial requirements of his clients, he and his team are able to deliver tailored legal solutions while consistently maintaining a focus on their clients’ goals.
As a partner in McDermott’s global investment funds practice, Frank Müller advises clients not only on domestic matters but also on international fund investments, fund structuring, and inbound and outbound investments.
Frank Müller has been sharing his expertise for many years as a lecturer at universities, industry associations, and other events. He also serves as Office Managing Partner of McDermott’s Frankfurt office.
- Advising multiple insurance companies, pension schemes and pension funds on investments in real estate-, infrastructure-, debt- and private equity funds.
- Advising fund management companies and fund sponsors on the structuring and formation of open-ended and closed-ended alternative investment funds.
- Advising asset managers on the structuring of complex club deals in the real estate and infrastructure sector.
- Advising fund management companies and securities institutions on their establishment and licensing procedures.
- Advising Union Investment Real Estate on the sale of FÜNF HÖFE in Munich, which McDermott described as one of Germany’s largest single-asset transactions of 2024.
- Chambers Europe, Band 5 in Germany: Investment Funds, 2026
- JUVE Handbook of Commercial Law Firms, Recommended, Investment Funds and Real Estate Law, 2020-2026
- Legal 500 EMEA, Recommended, Germany: Investment Funds and Real Estate Law, 2021-2026
- Managing partner, McDermott’s Frankfurt office
- gif Gesellschaft für immobilienwirtschaftliche Forschung e.V
- IMMOEBS e. V.
- ULI Urban Land Institute
- IREBS International Real Estate Business School, University of Regensburg, Real Estate Economist
- Higher Regional Court of Coblence, Second State Exam
- University of Trier, First State Exam
- University of West London, Erasmus
- Germany
- English
- German

Stacy A. Lutkus
Stacy A. Lutkus focuses her practice on all aspects of complex reorganization matters. She advises clients in preparing Chapter 11 matters for filing and negotiating restructuring transactions, including distressed asset sales and purchases, debtor-in-possession financing and exit financing. Stacy represents debtors, hedge funds and bank lenders in the oil & gas, financial services, real estate, telecommunications, travel and gaming industries.
- Representing the general unsecured creditors’ trust of a major automotive manufacturer
- Represented the indenture trustee for more than $6 billion of Puerto Rico Government Development Bank Bonds*
- Represented ad hoc creditor group of funds holding prepetition second lien obligations in the chapter 11 cases of a renewable energy development company and its subsidiaries in connection with efforts to participate in a backstop to a rights offering*
- Global Restructuring Review GRR 30, Recommended, 2024
- Lawdragon 2020 Leading US Bankruptcy and Restructuring Lawyers
- International Insolvency Institute NextGen Leadership Program
- Fulbright Scholar
- American Bankruptcy Institute, member
- Federal Bar Council, bankruptcy litigation committee
- INSOL, member
- University of Pennsylvania Law School, JD
- Drexel University, BS, magna cum laude
- New York
- Pennsylvania
- US Court of Appeals for the Third Circuit
- US District Court for the Eastern District of New York
- US District Court for the Northern District of New York
- US District Court for the Southern District of New York
- US District Court for the Eastern District of Pennsylvania
- English
- French
- German

Brian H. Jenn
Brian H. Jenn focuses his practice on US and international tax matters for US and foreign multinationals and other clients. As former Deputy International Tax Counsel (DITC) for the US Department of Treasury, Brian has extensive experience and insight on the Tax Cuts and Jobs Act (TCJA), having been deeply involved in the process of issuing proposed and final regulations and other guidance implementing the TCJA. Brian also has significant insights on taxation of the digital economy, transfer pricing and US taxation of foreign currencies.
Prior to joining McDermott, Brian spent several years at the US Department of Treasury where he was an attorney advisor, and most recently DITC. While at Treasury, he served as co-chair of the Organisation for Economic Co-operation and Development’s (OECD) Task Force on Digital Economy and as US delegate to the Committee on Fiscal Affairs. In this capacity, Brian led Treasury’s engagement at the OECD on digital tax issues, playing a central role in discussing tax challenges associated with the digitalization of the economy, as well as the development of new international norms for allocating tax rights among countries.
- Chambers USA, Tax, 2022 and 2024-2026
- Legal 500 US, Recommended, 2021, 2024
- Board of Trustees, Embers Academy, Niles, IL
- Yale Law School, JD
- Northwestern University, MA
- Northwestern University, BA, summa cum laude, Phi Beta Kappa
- Illinois
- District of Columbia

Caroline Reignley
Caroline Reignley provides strategic legal, regulatory and compliance counsel to for-profit and nonprofit hospitals, health systems, other healthcare providers, life sciences and technology companies.
Fraud and Abuse
Caroline counsels clients on interpretation and risk mitigation under the Anti-Kickback Statute, Stark Law and EKRA. She also advises on internal and government investigations related to the False Claims Act, Stark Law and Anti-Kickback Statute. Her extensive experience navigating civil and criminal investigations within the healthcare space informs her strategic approach to risk management in transactions and the development of robust compliance programs.
- Successfully defended multiple health systems in government investigations and related False Claims Act cases.
- Represented health systems, hospitals and physician practices that submitted Stark Law self-disclosures.
- Reviewed compensation arrangements between a large hospital and its independent and employed physicians to ascertain whether historical compensation methodologies or actual compensation were likely to cause legal risk under applicable law.
- Best Lawyers in America, Health Care Law, 2027
- Legal 500 US, Recommended, 2024
- The Best Lawyers, Ones to Watch, Health Care Law, 2021 – 2023
- Georgetown University Law Center, JD
- Clemson University, BS, magna cum laude
- District of Columbia
- Virginia
