Counsels financial institutions, borrowers, and issuers on leveraged finance transactions across a wide array of industries including healthcare, life sciences, technology, food and beverage, and retail
Advises private equity firms and portfolio companies on acquisition credit facilities, leveraged dividend transactions, and other financings
Handles private equity and mezzanine investments, out-of-court debt workouts and restructurings, and cross-border lending transactions
Represents venture lenders in senior and subordinated secured facilities, including negotiation of subordination agreements
Gary B. Rosenbaum counsels clients on all types of finance transactions, including private equity and mezzanine investments, out-of-court debt workouts and restructurings, cross-border lending transactions, and venture lending financings.
Gary advises various financial institutions, as well as borrowers and issuers, in structuring, negotiating, and documenting leveraged finance transactions in a broad range of industries, including healthcare, life sciences, telecommunications, internet and other technology fields, retail stores, food and beverage products, and manufacturing. He also has substantial experience representing private equity firms and their portfolio companies in acquisition credit facilities, leveraged dividend transactions, and an array of other financings.
While in law school, Gary was a member of the UCLA Law Review and a member of its board of editors.
- Represented Comvest Partners, an operationally focused middle-market private investment firm, in the syndicated acquisition financing that enabled Comvest to purchase Your Behavioral Health, a behavioral health services platform based in Torrance, California
- Represented MidCap Financial Services, as administrative agent for a syndicate of lenders, with a senior secured credit facility provided to Blue Wolf Capital, a New York-based private equity firm, to enable Blue Wolf to acquire RHA Health Services, LLC and several of its affiliates from Formation Capital and Safanad Ltd.
- Represented Oxford Finance, LLC, a specialty lender focused in the life sciences and healthcare sectors, as a lender and administrative agent in the negotiation and documentation of a $137.5 million senior secured credit facility provided to Apotheco Pharmacy, a portfolio company of Waud Capital, the proceeds of which were used to finance the Apotheco’s acquisition of several California-based dermatology-focused pharmacies
- Best Lawyers in America, Banking and Finance Law, Securitization and Structured Finance Law, 2007-2027
- Chambers USA, Banking & Finance, 2005-2026
- Legal 500 US, Recommended, 2016-2025
- IFLR1000, Banking, 2022-2023
- Southern California Super Lawyer, Corporate Finance
- American Bar Association, Business Law Section, Commercial Financial Services, International Commercial Law and Secured Transactions Committees
- State Bar of California, served on the Uniform Commercial Code Committee
- Los Angeles County Bar Association
- University of California, Los Angeles School of Law, JD
- Northwestern University, BA
- California
- English

Brandon Roker
Brandon Roker focuses his practice on white-collar criminal defense, qui tam litigation, internal investigations and complex commercial litigation. He has extensive experience representing clients in voluntary disclosures and in connection with government investigations, including investigations by the US Department of Justice (DOJ), the US Securities and Exchange Commission (SEC), the Department of Health and Human Services Office of Inspector General and the Division of Occupational Safety and Health (Cal/OSHA).
- Represented numerous manufacturers, providers and health systems in connection with qui tam cases and voluntary disclosures to the Department of Health and Human Services Office of Inspector General
- Represented a former executive officer of a publicly traded mortgage company that was subject of parallel SEC and criminal investigations related to sub-prime lending
- Best Lawyers in America, Criminal Defense: White-Collar (2023-2027), Litigation – Securities 2026-2027
- Super Lawyers, Southern California, 2015-2021
- University of California, Los Angeles School of Law, JD
- University of California, San Diego, BA
- California
- US District Court for the Central District of California
- US District Court for the Northern District of California
- US District Court for the Southern District of California

Allison Wilkerson
Allison Wilkerson focuses her practice on employee benefits matters. She has extensive experience handling issues pertaining to the Employee Retirement Income Security Act of 1974 (ERISA) and employee stock ownership plans (ESOPs).
- Advised an ESOP trustee on the purchase of a $270 million company consisting of a group of hospitals from an individual seller and multiple private equity warrant holders
- Advises a public telecommunications company on the design and administration of multiple nonqualified deferred compensation plans
- Advises a public beverage manufacturing company on employee benefit matters relating to an IRS audit of multiple qualified retirement plans
- Best Lawyers in America, Lawyer of the Year: Employee Benefits (ERISA) Law in Dallas/Fort Worth (2023), Employee Benefits (ERISA) Law, 2015-2025
- Best Lawyers in America, Employee Benefits (ERISA) Law, 2015-2027
- Legal 500 US, Recommended, 2019, 2021-2025
- Chambers USA, Employee Benefits & Executive Compensation, Band 1, 2025-2026; Band 2, 2020-2024
- Law360, MVP of the Year in Benefits, 2024
- Super Lawyers
- ESOP Association Public Policy Council, member
- ESOP Association, director of the Southwest Chapter, and associate member of the Legislative & Regulatory Advisory Committee
- The University of Texas School of Law, JD, with honors
- Baylor University, BBA
- Texas

Nicole M. Pearl
Nicole M. Pearl advises clients on estate planning, wealth transfer planning, marital property agreements, business succession planning and post-death administration. Her clients include family offices, entrepreneurs and business owners, real property investors, private equity fund managers, and entertainment industry figures.
- Chambers High Net Worth, Band 1 in California: Southern: Private Wealth Law, 2016-2026; Band 1 in Nationwide: Private Wealth Law: Western Region, 2025-2026, and Band 2, 2016-2024
- Best Lawyers in America, Trusts and Estates, 2021 and 2026-2027
- Best Lawyers in America, Trusts and Estates, 2013–2026
- Chambers USA, Wealth Management, 2013–2017
- American College of Trust and Estate Counsel, Fellow
- USC, Trust and Estate Conference Planning Committee
- University of California, Berkeley School of Law, JD
- University of Illinois at Urbana-Champaign, BA, cum laude
- California

James F. Owens
James (Jim) F. Owens serves as counsel to a variety of nonprofit and for-profit health care businesses, with a focus on transactional and regulatory advice. His clients include multi-facility health systems, academic and community hospitals, county medical centers, healthcare districts, children’s hospitals, medical foundation clinics, ambulatory surgery centers, imaging centers, dialysis centers, health plans, physician and dentistry practice management companies, and large medical groups.
- Assisted with the formation of a limited liability company among Anthem Blue Cross and six other competitive hospital systems in the Los Angeles area. The venture, “Anthem Blue Cross Vivity,” offers a network of 6,000 doctors and 14 hospitals, in total, to large self-insured employers
- Chambers USA, Band 1 in Healthcare, 2007-2025
- Best Lawyers in America, Health Care Law, 2012-2026
- Thomson Reuters, Stand-out Lawyer – independently rated lawyers, 2024-2025
- Acritas Stars, listed among independently rated lawyers, 2020
- Lawyers Guide to Health Care Law, published by Corporate Counsel Magazine, 2012
- American Health Lawyers Association, former chair of the Hospitals and Health Systems practice groups and former member of the program committee for the Health Transactions Program
- California Society for Healthcare Attorneys
- National Association for Law Placement (NALP) Foundation for Law Career Research, board of directors
- Stetson University College of Law, JD
- Emory University, BA
- California
- Georgia

Michael G. Morgan
Michael (Mike) Morgan is recognized as one of the nation’s leading lawyers in cybersecurity and data privacy. He has guided clients through some of the largest and most complex data breaches, breaches involving more than 50 million records, incidents affecting persons in over 100 countries around the world, and incidents involving sensitive defense-related information. He counsels clients on compliance with US and international regulations relating to cybersecurity and data privacy, including compliance with the California Consumer Privacy Act (CCPA), the EU’s General Data Protection Regulation (GDPR) and China’s Network Security Law. Mike leads the firm’s Data, Privacy & Cybersecurity Group.
- Advised a global provider of connected car applications on compliance with privacy and cybersecurity regulations, including the GDPR and China’s Cybersecurity Law
- Advised a big data company on its cybersecurity compliance program, including the development and implementation of a vulnerability management and data breach response plan
- Advised an Internet of Things (IoT) provider on compliance issues arising from the global launch of a personal digital assistant device
- Chambers USA, Privacy & Data Security, 2025-2026
- Legal 500 US, 2022-2025
- Lexology Data 100, Recommended, 2026
- Cybersecurity Docket, Incident Response Elite list, 2016, 2019 to 2022, 2026
- Los Angeles City College Foundation, board member
- University of California, Los Angeles School of Law, JD
- The Wharton School of the University of Pennsylvania, BS, cum laude
- California
- Supreme Court of the United States
- US District and State Courts of California (all)
- US District Court for the District of Colorado
- US Court of Appeals for the Ninth Circuit
- US Court of Appeals for the Tenth Circuit
- English

Joel R. Grosberg
Joel R. Grosberg is co-head of McDermott’s Antitrust Mergers Focus Group and assists clients on civil and criminal antitrust matters, including obtaining merger clearances, counseling and litigation. He has represented clients in obtaining antitrust approvals in numerous challenging transactions, and in other government antitrust investigations before the Department of Justice, the Federal Trade Commission (“FTC”) and foreign competition authorities. Joel has significant experience in the high tech, chemical, health care and life sciences industries, including counseling on matters related to pricing and distribution practices and other competition-related issues.
- Obtained merger clearances for Motorola Solutions, Inc.’s acquisitions of Airbus’ DS Communications business, Kodiak, and other transactions
- Obtained merger clearances for DaVita’s acquisition of Renal Ventures Management, L.L.C., DSI Renal, Inc., and the acquisition of the US renal care business of Gambro Healthcare
- Successfully defended clients in FTC conduct investigations in the semiconductor and electronic health industry
- Best Lawyers in America, Antitrust Law, 2022-2027
- Global Competition Review, GCR 100, Recommended, 2025-2026
- District of Columbia Courts, Capital Pro Bono Honor Roll, 2023
- Super Lawyer, Washington, DC, Antitrust, 2018-2021
- Cornell Law School, JD
- University of Michigan, BA, high distinction
- District of Columbia
- New York

Jennifer S. Geetter
Assists in the design, deployment, and ongoing implementation of innovative care delivery models for life sciences, healthcare, and informatics clients
Regularly advises companies pivoting to healthcare vertical offerings based on legacy technology and strategic assets
Advises clients on AI governance, public trust, and AI deployment
Advises clients on HIE participation, data sharing and compliance
Counsels clients on the development of data and biospecimen registries, real-world evidence platforms, and biobanking programs
Jennifer S. Geetter focuses her practice on the development, delivery, and implementation of digital health and artificial intelligence (AI) solutions, data, and research. She works closely with both adopters and developers to bring innovation in healthcare diagnosis, treatment and delivery to patients and providers, offering guidance on patient onboarding, provider implementation, privacy, and regulatory issues. She advises global life sciences, healthcare, and informatics clients on legal issues related to digital health, biomedical innovation, research compliance, global privacy and data security laws, and financial relationship management.
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- Assisted an informatics company with interoperability, privacy, data strategies, and related considerations
- Assisted a retail client in launching a new health vertical built on the backbone of legacy technology and expertise
- Assisted a client in responding to the unauthorized disclosure of company records to public-facing AI engines
- Provided comprehensive advice on the delivery of virtual health solutions to support and expand primary care
- Assisted in the development and deployment of network research arrangements
- The Best Lawyers in America, Healthcare Law, 2022-2027
- Chambers USA, Healthcare, 2020-2026
- District of Columbia Courts, Capital Pro Bono High Honor Roll, 2023
- Human Rights First, board of directors
- Ohev Sholom Congregation, board of directors
- Harvard Law School, JD, cum laude
- Columbia College, BA, magna cum laude
- District of Columbia
- Massachusetts
- New York
- English

Antoine Vergnat
Antoine Vergnat focuses his practice on advice to French and non-French investment funds, corporate groups and entrepreneurs operating in the industrial, service and real estate sectors on a broad range of domestic and international tax matters. Antoine focuses his practice on transactional tax law, with an emphasis on matters relating to the acquisition and sale of assets, the financing and restructuring of groups, as well as the management of tax affairs and controversies before tax authorities.
Antoine also regularly provides tax advice to high-net-worth individuals on a broad range of domestic and international tax matters and has significant experience in the structuring of equity compensation schemes for management teams.
- Advised several sponsors, founders and management teams on private equity deals
- Advised an Italian worldwide leader in the beverage industry on a post-deal restructuring
- Advised a French worldwide leader in the tableware industry on a global tax planning
- The Legal 500 EMEA, Leading Individual in France: Tax, 2025-2026
- Chambers France, Band 5 in Tax, 2026
- The Best Lawyers in France, Tax Law, 2025 & 2026
- Chambers Europe, France: Tax, 2023-2024
- International Tax Review, World Tax, 2023-2026
- Décideurs, Taxation of International Conglomerates, Highly Recommended, 2021
- Décideurs, LBO Taxation, France, Excellent, 2021
- ESSEC Business School
- Paris Dauphine University – PSL, LLM (DESS), Corporate Taxation
- Paris 1 Panthéon-Sorbonne University, Master’s, Tax Law
- Paris
- English
- French
- Italian

Emmanuelle Trombe
Emmanuelle Trombe is the co-head of the Firm’s Life Sciences industry practice. She represents pharmaceutical, medical device and bio-pharmaceutical companies globally in transactional matters in relation to M&A and divestitures, joint ventures and strategic partnerships, large-scale projects, outsourcing projects, product development, licensing agreements and regulatory matters. She also advises venture capital funds and bio-pharmaceutical companies in connection with a broad range of financing activities. As well as co-heading the Firm’s Life Sciences Group, Emmanuelle serves as an elected member of the Firm’s Management Committee.
Emmanuelle is distinguished in Chambers Europe and Legal 500 EMEA in life sciences transactions, where she is highly recommended for her experience in the pharmaceutical, healthcare, biotech and medical devices industries and described as very responsive, smart, flexible and business-minded. She has been distinguished as the Lawyer of the Year in Life Sciences for 2024.
- Advised Orano Med its in collaboration with Molecular Partners to co-develop novel Radio-DARPin therapeutics (RDTs) that use Orano Med’s 212Pb radioisotope as a payload to selectively kill cancer cells
- Advised Pierre Fabre in the acquisition of Kinnate Biopharma’s investigational pan-RAF inhibitor, Exarafenib, and other pan-RAF program assets
- Advised Owkin on funding to launch Bioptimus, the first universal AI model designed to fuel breakthrough discoveries and accelerate innovation in biomedicine
- Advised Sensorion, a pioneering clinical-stage biotechnology company specializing on the development of new therapies to restore, treat and prevent hearing loss disorders, on its new financing of over EUR 50 million from existing and new investors specializing in the healthcare sector
- Advised Novartis Groupe France SAS in the sale of the company CellforCure and its cell and gene therapy development and production site in Les Ulis, France, to Seqens SAS
- Advised Aqemia, a pioneering pharmatech company leveraging AI and quantum-inspired physics to accelerate the discovery of small molecule drug candidates with higher probability of success in the clinic, in its multi-year research collaboration with Sanofi
- The Legal 500 EMEA, Hall of Fame, France: Healthcare and Life Sciences, 2026
- The Legal 500 EMEA, Leading Individual in France: Healthcare and Life Sciences, 2022-2025
- Chambers France, Band 1 in Pharma/Life Sciences: Corporate, 2026
- Best Lawyers in France,, Corporate Law & Biotechnology and Life Sciences, 2012-2026
- Chambers Europe, , Band 1 in France: Pharma/Life Sciences, 2014-2024
- Médecins sans Frontières, regularly provides contractual advice to this international humanitarian medical association
- ESCP Business School
- Paris-Panthéon-Assas University, LLM, Tax and Commercial Law
- Complutense University of Madrid, Master’s, AMSEC
- Paris
- English
- French
- Spanish
- Italian
