Tom is a 35-year veteran of the firm. Tom’s practice focuses on healthcare litigation. He represents major health providers in mass tort litigation, class actions, antitrust cases, and qui tam False Claims Act cases involving allegations of violation of federal and state healthcare laws and regulations.
- Co-counsel to the University of New Mexico in a class action in New Mexico state court asserting alleged mass torts at the University’s pediatric cancer program (Cummings et al. v. Regents of the University of New Mexico)
- Co-counsel to the University of Southern California concerning class action litigation in the United States District Court in Los Angeles, litigation in the Superior Court in Los Angeles and governmental investigations involving alleged mass torts at the University’s Student Health Center (In re Student Health Center Tyndall Litigation)
- Co-counsel to the University of California concerning litigation in the California Superior Court for the County of Orange involving alleged mass torts at the University of California Irvine Reproductive Health Center (Asch v. Regents of the University of California)
- Best Lawyers in America, Healthcare Law, (2013-2024 and 2026-2027), Litigation – Health Care, Commercial Litigation, 2026-2027
- California Lawyer, California Super Lawyer, Health Care and Business Litigation
- University of California, Berkeley School of Law, JD
- Princeton University, BA
- California

Eric M. Preston
Eric M. Preston focuses his practice on corporate transactional matters. He advises public and private companies, private equity firms and their portfolio companies in mergers, acquisitions, formations, restructurings and divestures.
While in law school, Eric was the executive online editor of the Emory Law Journal.
- Represented a leading provider of pediatric home health services, in its merger to form, the nation’s largest provider of pediatric home care services*
- Represented the nation’s largest provider of pediatric home care services, and its predecessor in several add-on transactions*
- Best Lawyers: Ones to Watch in America, Corporate Law, 2021-2027
- Emory University School of Law, JD, Order of the Coif
- University of Illinois at Urbana-Champaign, BA
- Illinois
- Georgia

Dr. Florian Schiefer
Advises on the tax aspects of complex private equity, M&A and real estate transactions in Germany and internationally.
Structures acquisitions, reorganizations and restructurings from a German and cross-border tax perspective.
Designs and implements tax-efficient fund and investment structures for sponsors and institutional investors.
Florian Schiefer advises private equity sponsors, real estate investors, fund sponsors, institutional investors, and domestic and international companies on complex German and cross-border tax matters arising in connection with transactions, investments, corporate reorganizations, and restructurings. His practice focuses on the tax aspects of domestic and cross-border M&A and real estate transactions.
He advises clients throughout the entire transaction lifecycle, from tax due diligence, acquisition and financing structuring, and transaction documentation through to the implementation of acquisition structures and post-closing integration. A particular focus of his practice is the design of tax-efficient acquisition, holding, and investment structures for corporate groups, private equity sponsors, and real estate investors.
Florian also has extensive experience advising on the taxation of investment fund structures. He advises fund sponsors on the structuring and establishment of investment funds, as well as institutional and private investors on investments in domestic and international fund platforms. His practice covers, in particular, private equity, real estate, and other alternative investment funds, including the design of tax-efficient investment and holding structures.
Clients value Florian’s ability to combine technical tax expertise with a pragmatic understanding of the commercial objectives and execution challenges of complex transactions, enabling him to deliver practical and solution-oriented advice.
In addition to his legal practice, Florian regularly publishes on current developments in German and international tax law. He is a lecturer in International Taxation at the University of Bamberg and frequently speaks at conferences and seminars on tax-related topics.
Florian advised:
- SIGNA on the acquisition of GALERIA Kaufhof from Hudson‘s Bay Company and the subsequent integration with Karstadt
- Tether on the sale of a majority stake in Northern Data to RUM Group Inc.
- Attestor and Bentham Capital on the acquisition of multiple commercial real estate assets in Berlin and Hamburg.
- International Tax Review, World Tax, 2022-2026
- The Legal 500 EMEA, Recommended, Germany: Tax, 2023
- Handelsblatt/Best Lawyers™, “Ones to Watch” in Germany: Corporate and Tax Law, 2022-2023
- International Fiscal Association (IFA)
- Expert Advisor on International Tax Law
- Certified Tax Advisor
- University of Bamberg, Dr. rer. pol. (PhD)
- University of Bamberg, Dipl.-Kfm.
- Germany
- German
- English

George Tzanetakos
George Tzanetakos advises hospitals, health systems and other health industry clients on a variety of regulatory and transactional matters, including mergers, acquisitions, affiliations and joint ventures.
During law school, George served as a law clerk for the general counsel of a large Iowa health system, held a research assistantship at the University of Iowa Department of Health Management and Policy’s Rural Policy Research Institute, and was an intern for the United States Attorney’s Office for the Northern District of Iowa.
- Best Lawyers: Ones to Watch in America, Health Care Law, 2027
- American Health Lawyers Association
- Hellenic Bar Association
- University of Iowa College of Law, JD
- University of Iowa College of Public Health, MHA
- University of Iowa, BA, University Honors
- Illinois
- Greek

Sally A. Rosenberg
As one of the Firm’s deputy general counsels, Sally A. Rosenberg works with the general counsel to oversee McDermott’s integrity and compliance initiative.
- Developed interactive online training tools on key Firm compliance tools
- Teamed to update the Firm’s Global Data Privacy and Protection Program
- KID Museum, board member
- Imagination Stage, president emeritus
- Harvard Law School, JD, cum laude
- Yale University, BA, summa cum laude, Phi Beta Kappa
- District of Columbia

Carole M. Becker
Carole M. Becker’s practice focuses on regulatory and transactional healthcare and life sciences matters. She conducts due diligence to support traditional and non-traditional healthcare clients as they grow and innovate within the sector. During law school, Carole served as the executive managing editor for the Journal of Law & Public Policy.
- Best Lawyers: Ones to Watch in America, Healthcare Law, 2024-2026

M. Brian Hall, IV
With his wide-ranging knowledge in transactional and regulatory issues, M. Brian Hall, IV counsels clients across the healthcare industry. He navigates hospitals, ambulatory surgery centers, physician practices, pharmacies, private equity sponsors and their portfolio companies through complex transactions with his strategic guidance.
His insight has resulted in closing numerous healthcare transactions, including mergers, acquisitions, joint ventures and strategic affiliations. From a regulatory perspective, Brian focuses on fraud and abuse matters relating to the Stark Law and Anti-Kickback Statute, reimbursement and payment reform issues, and compliance issues. He also consults with clients on multifaceted, ongoing health regulatory and operational issues.
- Best Lawyers: Ones to Watch in America, Healthcare Law (2023-2026), Mergers and Acquisitions Law, 2026
- Super Lawyers, Washington, DC, Rising Star, Healthcare Law, 2020-2025
- American Health Lawyers Association, Member
- DC Bar, Health Section
- University of Maryland Francis King Carey School of Law, JD, cum laude
- Cornell University, MHA
- Cornell University, BS
- District of Columbia
- Maryland

David Grimes
With more than 30 years of experience, David Grimes focuses his practice on cross border and domestic M&A, securities, commercial and restructuring transactions. He represents companies and private equity funds in their acquisitions, dispositions and joint ventures. He also represents venture funds in their investments, and financial institutions in their financing transactions and restructurings. David counsels clients in various industries, including media, life sciences, financial institutions and industrials.
Prior to joining McDermott, David co-founded another AmLaw 100’s Paris office and was the former head of its cross-border transactions practice group.
- Represented the owners of Bansard International in the sale of Bansard, a global transport and logistics provider, to SEKO Logistics, a portfolio company of Ridgemont Equity Partners
- Represented Seventh Avenue Investments LLC in connection with numerous equity and convertible debt investments in numerous sectors, including integrated cannabis companies (multi-state and publicly-traded operators)
- Represented Volery Capital Partners, a U.S. private equity fund focused on investments in the financial services industry, in numerous equity and debt investments
- Legal 500 US, Leading Lawyer in M&A/Corporate & Commercial: M&A: middle market ($500m-999m), 2022-2024
- The M&A Advisor, Cross Border M&A Deal of the Year, 2015
- Emory University School of Law Advisory Board, member
- Anchor Health Initiative, co-founder and board member
- Emory University School of Law, JD
- London School of Economics and Political Science, MSc
- College of William & Mary, BA
- New York
- English
- French

Emilie O’Toole
Emilie O’Toole focuses her practice on various commercial litigation matters, including white collar and securities defense matters, product liability actions, and class actions. She represents clients in both federal and state courts across the country. She has experience trying cases in federal court, arguing before the Seventh Circuit, and arguing and drafting a variety of motions in both state and federal court.
- Represented the officers and directors of a nationally recognized utility in derivative and class action litigation arising from large-scale wildfires
- Represented cell phone manufacturer in coordinated actions alleging that cell phones caused plaintiffs’ brain cancer
- Best Lawyers: Ones to Watch in America, Criminal Defense: White-Collar, 2026-2027
- Named a 2021 Rising Star by the National Immigrant Justice Center
- Member, Legal Aid Chicago Ambassadors Board
- Northwestern Pritzker School of Law, JD, cum laude
- Boston University, BS
- Illinois
- US Court of Appeals for the Seventh Circuit
- US District Court for the Northern District of Illinois

Nickou Oskoui
Nickou Oskoui focuses his practice on technology transactions, outsourcing and other commercial transactions. Nickou counsels clients in a wide variety of technology transactions, including cloud computing, software licenses, technology development and licensing agreements, e-commerce arrangements, software-as-a-service (SaaS), technology maintenance and service agreements and software compliance audits.
- Represented major accounting, tax, consulting and business advisory firm in numerous licensing and professional services agreements with several of its vendors
- Assisted in the representation of major oil field services company in intellectual property cross licensing and transaction services agreements as part of the sale of surface pressure control business unit
- Represented multiple pharmaceutical companies in data licensing and analytics agreements to identify subjects for clinical trials
- Represented startup technology company in negotiating agreements for development and publishing of a mobile golf game
- Represented numerous clients in negotiating cloud services agreements with the likes of Oracle, Microsoft, and SAP
- The Best Lawyers: Ones to Watch in America, Corporate Law, 2024-2025
- University of Illinois College of Law, JD, magna cum laude
- The University of Texas at Austin, BS
- Texas
- US Court of Appeals for the Federal Circuit
- US District Court for the Northern District of Texas
- US District Court for the Eastern District of Texas
- US Patent and Trademark Office
- English
