Berät Investoren bei inländischen und grenzüberschreitenden Immobilientransaktionen.
Begleitet großvolumige Entwicklungsprojekte und zählt zu den führenden Beratern bei Vermietungen von Immobilienprojekten in der Entwicklungsphase.
Strukturiert und verhandelt komplexe immobilienbezogene Management- und Dienstleistungsverträge.
Unterstützt Immobilieninvestoren bei Joint-Ventures, Immobilienfinanzierungen, Distressed- und NPL-Transaktionen.
Thomas Beisken berät in- und ausländische Immobilieninvestoren, insbesondere Private-Equity-Fonds, Versorgungswerke, Immobilienberatungsunternehmen, Family Offices und Finanzinstitute, zu allen Fragen des Immobilienwirtschaftsrechts, insbesondere in den Bereichen Immobilientransaktionen (Asset und Share Deals, Einzel- und Portfoliotransaktionen), Projektentwicklungen, Asset und Property Management, Gewerbliches Mietrecht, Immobilienfinanzierungen und Immobilien-Joint Ventures.
Er verfügt über Spezialexpertise insbesondere in den Bereichen Büro- und Retailimmobilien, Residential and Student Living, Projektentwicklungen und Forward Deals.
Thomas Beisken beriet:
- Art-Invest bei verschiedenen Transaktionen, u.a. Kaiserhof in Köln (Allianz-Immobilie am Kaiser-Wilhelm-Ring), Fürst und Friedrich in Düsseldorf, Neuer Kanzlerplatz in Bonn und Alter Wall in Hamburg
- Blackstone bei dem Erwerb des Hochhauses Pollux in Frankfurt
- Branicks-Group bei dem Erwerb und der Veräußerung verschiedener Immobilien in ganz Deutschland, u.a. in Berlin, München, Darmstadt und Bonn, sowie bei diversen Vermietungsaktivitäten
- Handelsblatt/Best Lawyers™, „Einer der führenden Anwälte“ in Deutschland: Immobilienwirtschaftsrecht, 2021-2027
- JUVE Handbuch Wirtschaftskanzleien, Empfohlen: Immobilien- und Baurecht: Immobilienwirtschaftsrecht sowie Projektentwicklung und Anlagenbau, 2023-2025
- The Legal 500 EMEA, Deutschland: Immobilienwirtschaftsrecht, 2022
- Rechtsanwaltskammer Düsseldorf
- Oberlandesgericht Düsseldorf, Zweites Staatsexamen
- University of Canterbury, LL.M.
- Universität Bonn, Erstes Staatsexamen
- Universität Freiburg
- Deutschland
- Deutsch
- Englisch

Dr. Thomas Ammermann
Dr. Thomas Ammermann gehört der internen Praxisgruppe für Gesellschaftsrecht an und ist in den Bereichen Gesellschaftsrecht und Kapitalmärkte spezialisiert.
Dr. Ammermann berät Mandanten insbesondere aus der gewerblichen Industrie, dem Automobilsektor, der Hotellerie- und Immobilienbranche und dem Logistiksektor im Gesellschaftsrecht und bei Unternehmenstransaktionen (M&A). Dazu gehören auch gesellschaftsrechtliche Neustrukturierungen, grenzüberschreitende Verschmelzungen und Joint Ventures.
Dr. Ammermann verfügt über umfassende Erfahrung mit grenzüberschreitenden Sachverhalten. 2012 war er im gesellschaftsrechtlichen Dezernat unseres New Yorker Büros tätig.
Bevor er zu McDermott Will & Schulte stieß, war Dr. Ammermann wissenschaftlicher Mitarbeiter an der Universität Würzburg. Für seine in dieser Zeit entstandene Dissertation erhielt er 2008 den Carl Goerdeler-Preis der Stadt Leipzig.
- The Legal 500 EMEA, Corporate and M&A, 2016
- Oberlandesgericht Kobelnz, Zweites Staatsexamen
- Universität Würzburg, Dr. jur.
- Universität Würzburg, Erstes Staatsexamen
- Paris Nanterre University
- Universität Regensburg
- Deutschland
- Deutsch
- Englisch
- Französisch

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
- Chambers USA, Healthcare-Massachusetts, where he “…is praised for his transactional expertise. One client states that his knowledge of mergers is ‘encyclopedic,’”2013 to 2021,
- The Best Lawyers in America, Health Care Law, 2019 to 2022
- 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

Matthew J. Friendly
Matthew J. Friendly advises clients on both the buy- and sell-side of complex healthcare transactions. He represents private equity firms and their portfolio companies, strategic investors, management companies, and a broad spectrum of healthcare organizations in platform and add-on acquisitions of physician practice management companies, ambulatory surgery centers and other healthcare businesses in a variety of sub-sectors.
In addition to his dealmaking experience, clients also turn to Matthew for outside general counsel advice on corporate governance and healthcare regulatory matters, including navigating corporate practice of medicine and state and federal fraud and abuse laws. He also helps organizations effectively structure and negotiate joint ventures, employment and consulting agreements, and a wide range of other healthcare and corporate contractual matters.
- Represented a private equity fund in its purchase of a dental management services organization and assets of 39 managed dental practices in Texas for approximately $135 million
- Represented a Nevada-based hospitalist services company in its sale to a private equity buyer for $44.7 million
- Represented the owners of multiple pain-management clinics, ambulatory surgical centers and affiliated ancillary facilities in Georgia in their sale and merger into a competitor for approximately $86.5 million
- The Ambulatory M&A Advisor, Top Healthcare Transactions Lawyers, Rising Star 2014 to 2017
- Lawyers for Children America, volunteer attorney ad litem
- JDRF Miami One Walk, Corporate Recruitment Committee, 2015
- Make a Wish South Florida, wish granter
- University of Miami School of Law, JD, magna cum laude
- Harvard College, BA
- Florida

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
- Englisch
- Französisch

Michael S. Stanek
Michael (Mike) S. Stanek is a client-focused compliance, investigations, and litigation lawyer. He represents corporations, boards and individuals in a range of investigation, enforcement and litigation matters; including the Foreign Corrupt Practices Act (FCPA) and anti-corruption laws, the federal securities laws, healthcare fraud, and corporate disputes. He has extensive e-discovery experience and is highly skilled in designing and managing complex multinational investigations. Mike also advises clients and deal teams on due diligence matters and counsels clients with respect to their corporate compliance programs, including policies, risk assessment and training.
- Conducted internal investigations concerning FCPA matters for multinational clients in the medical device, healthcare, and energy industries, across multiple geographies, including China, India, Korea, and South Africa
- Represented public medical device company in SEC and DOJ investigations regarding FCPA and revenue recognition issues in Africa, Asia, and South America
- Managed audit committee investigation concerning accounting issues and executive misconduct for enterprise software company
- Successfully defended healthcare company in False Claims Act litigation, resulting in dismissal by relator
- Successfully defended major accounting firm in SEC investigation into an audit client’s revenue recognition practices
- Served on FCPA Compliance Monitor team for major Latin American airline*
- Advised global financial institution on anti-corruption diligence matters in Asia*
- Serves on firm team representing The Mattachine Society of Washington, DC, in connection with its work to uncover deleted governmental documents evidencing discrimination against LGBT Americans
- Coordinated firm response team and coauthored amicus briefs regarding the 2017 travel ban
* Matter handled prior to joining McDermott.
- George Washington University Law School, JD, with honors
- DePaul University, BA, cum laude
- District of Columbia
- Pennsylvania

Michael Rosen-Prinz
Michael Rosen-Prinz works with individuals and families to solve problems and develop strategies for wealth transfer, family governance, business succession planning and estate, gift and generation-skipping transfer tax matters. Michael assists clients with the formation and operation of family offices and private trust companies, and the coordination of such structures with the family’s overall estate plan. Michael advises on tax, SEC and other regulatory compliance issues and has helped clients develop and implement policies and procedures for their private trust companies.
- Prepared straightforward and complex estate plans for individuals
- Established private trust companies for international and US families
- Performed tax efficient domestication of foreign trusts and restructuring of a complex, multibillion-dollar foreign and US structure
- Los Angeles Super Lawyers, Rising Star 2013 to 2018
- Chambers High Net Worth 2018 – 2021, Southern California Private Wealth
- The Best Lawyers in America 2018 – 2022, Trusts and Estates
- California Lawyers Association, executive committee member of Trusts and Estates Section
- Beverly Hills Bar Association, past chair of the Trust and Estates Section
- University of California, Berkeley School of Law, JD, with high honors
- University of California, Santa Barbara, BA
- 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

Romain Perray
Romain has extensive experience in data privacy and data protection law, and lectures on these subjects in Master of Law classes at the University of Paris-I Panthéon-Sorbonne, the University of Paris-II Panthéon-Assas and the University of Paris V Cité.
He advises on the full range of data protection and data security for clients in life sciences, automotive, ad techs, insurance, e-commerce, leisure, social networks and even the public sector, especially in the context of smart cities projects.
- Advised a multinational car manufacturer on its Global GDPR compliance program
- Advised a multi-jurisdictions B2C web platform in the course of investigations by the French Data Protection Authority
- Advised a multinational on the development and implementation of anonymization and pseudonymisation techniques in order to release special categories of data sets
- Advised a multinational on several contractual negotiations raising data capacities issues as data controller (joint or distinct) as well as data processor
- Advised a multinational on several data breaches
- Assisted biotech companies on several contractual negotiations with CROs and IT providers raising data capacities issues as data controller (joint or distinct) as well as data processor
- Advised a national professional association on the role of its members under GDPR and its impact on the sharing of personal data with public authorities
- The Best Lawyers in France, Lawyer of the Year, Privacy & Data Security Law, 2026
- Chambers France, Band 2 in TMT: Data Protection, 2025
- The Best Lawyers in France, 2022-2026
- The Legal 500 EMEA, Leading Individual, France: Data Privacy and Data Protection, 2023-2025
- Lexology Data 100, Recommended, 2026
- Chambers Europe, France: TMT: Data Protection, 2024
- Paris-Panthéon-Assas University, DEA in Public Law
- Paris-Panthéon-Assas University, Maîtrise in Comparative Law
- Institute of Political Sciences of Rennes, Major in Public Service
- University of the Western Cape, South Africa
- LLM Program
- Paris
- Englisch
- Französisch

Pierre-Arnoux Mayoly
Pierre-Arnoux Mayoly focuses on structured finance matters, in particular in the context of leveraged buyout (LBO) transactions, acquisition financing (build-up), funds financing (equity bridge/capital call financing) or debt restructuring. He represents financing providers – senior or subordinated – and sponsors and borrowers. Pierre-Arnoux is head of the Finance Department in Paris.
Prior to joining the Firm, he worked in the Paris offices of leading international law firms.
- The Legal 500 EMEA, Leading Partner in France: Banking and Finance, 2025
- Chambers France, Band 4 in Banking & Finance, 2025
- The Best Lawyers in France, 2021-2026
- Chambers Europe, France: Banking & Finance, 2022-2024
- City University of Hong Kong, LLM, International Business Law
- Law School of Aix-en-Provence University, Master’s, Public Finance and Tax
- Law School of Aix-en-Provence University, Master’s, Business Law and Corporate Taxation (DJCE/DESS)
- Paris
- Englisch
- Französisch
