Luis J. Perez focuses his practice on mergers and acquisitions and corporate governance matters, including international transactions, for clients operating throughout the United States and Latin America. Luis works with private and publicly held companies on all aspects of their business, from formation and governance issues to equity and debt offerings to acquisitions and dispositions.
Luis has substantial experience working with energy companies, including utilities and renewable energy developers, throughout the United States, Europe and Latin America. His client list includes a leading sustainable energy company in the United States and global leaders in clean energy. Luis also represents the interests of financial institutions and construction companies structuring public-private partnerships in the United States and Latin America.
· Latin Lawyer 250, Corporate and M&A, Highly Recommended, 2023
· Advanced Leadership Initiative Fellow, Harvard University, 2021
· Acritas Stars, Listed among independently rated lawyers, 2020
· Chambers USA, Corporate/M&A and Private Equity (Florida), 2020
- Catholic University of America Columbus School of Law, JD
- Rollins College, BA
- Florida
- Englisch
- Spanish

Usman Khan
Usman Khan is a partner in the Firm’s London-based Finance, Restructuring and Special Situations Group.
Usman is a private capital lawyer with a focus on the real assets sector, advising on complex, high-value transactions across real estate, infrastructure and energy. He acts for a broad range of clients, including private equity sponsors, debt funds, sovereign wealth funds, alternative capital providers and institutional investors. His practice covers the full spectrum of private capital deployment, with deep experience in both debt and equity structures, and a strong track record in helping clients structure, negotiate and execute bespoke financing solutions.
- Advised Tristan Capital Partners on the acquisition and same-day enforcement of a German mixed residential and commercial assets NPL portfolio
- Advised TPG Real Estate on the financing of its “StartLiving” joint venture with Gatehouse Investment Management to construct up to several thousand suburban, purpose-built family rental homes throughout the UK*
- Advised a US-based private equity fund on the refinancing of its Spanish residential portfolio*
- Advised a sovereign wealth fund and its co-investor on the refinancing of their PBSA portfolio across the UK*
- Advised a top-tier real estate investment manager on its initial refinancing of pan-European portfolio of logistics assets and then the subsequent acquisition financing of various pan-European logistics assets*
- Legal 500 UK, Recommended, M&A: Lower Mid-Market Deals, £100m-£750m, 2026, Next Generation Partner, Property Finance, 2021-2026
- London Asian & Business Awards, Finalist in “Rising Star of the Year in Finance”, 2023
- BPP Law School, LPC
- King''s College London, LLB
- England and Wales
- Englisch
- Urdu
- Hindi
- Punjabi

Ron Hauben
Ron Hauben has more than 30 years of experience navigating “bet the firm” litigation and regulatory matters, crisis management and compliance challenges. As the former vice chair and general counsel of Ernst & Young, he brings insider knowledge of the accounting profession and the legal, regulatory and business environment in which it operates.
- National Ability Center, board chairman
- The Preserve Homeowners Association, board member
- New York University School of Law, JD
- Binghamton University, BA
- New York

Elai Katz
Elai Katz is a strategic antitrust lawyer with over two decades of experience handling mergers and acquisitions, litigation, counseling and government investigations. He represents buyers and sellers across a range of industries, including financial services, insurance, healthcare, life sciences, online retail, beverage, airline, and media and telecommunications.
Clients value Elai’s ability to provide concise and pragmatic advice, explaining complex issues in simple terms. They turn to him for a practical, creative and informed lens on their antitrust matters. As clients have noted, „Elai is known for his great working relationship with regulators, wonderful legal services and deep industry knowledge“ and he „keeps a cool head in critical situations.“
- Obtained regulatory clearance in multiple acquisitions for numerous clients in the financial services, insurance, healthcare, life sciences, digital commerce, beverage and airline industries, among others*
- Successfully defended a global financial services company in a foreign exchange markets class action, winning a jury verdict following an eight-day trial*
- Represented scholars and experts in antitrust economics as amici curiae in the Supreme Court of the United States case Ohio v. American Express Co.*
- Best Lawyers in America, Antitrust Law, 2017-2026
- New York State Bar Association, William T. Lifland Award, 2025
- Chambers USA, 2008-2025
- Legal 500, Recommended, 2024-2025
- Lexology Index, Competition, Recommended & Thought Leader, 2024-2026
- Benchmark Litigation, National Practice Area Star and Litigation Star, 2023-2024
- Lawdragon 500, Leading Litigators in America, 2022 and 2025, Leading Global Antitrust & Competition Lawyers, 2025
- Global Competition Review, GCR 100, Recommended, 2026
- American Bar Association, Antitrust Section, vice chair of the International Comments and Policy Committee
- Yale Library Associates, trustee
- Yale University Library Council, member
- New York State Bar Association, Antitrust Law Section, former chair of the Executive Committee
- Columbia Law School, JD
- Yale University, BA
- New York
- Supreme Court of the United States
- US Court of Appeals for the Second Circuit
- US Court of Appeals for the Fifth Circuit
- US District Court for the Southern District of New York
- US District Court for the Eastern District of New York

David Herman
With a career that spans more than two decades, David Herman counsels real estate-related companies in connection with mergers, acquisitions and dispositions, joint ventures, going-private transactions and initial public offerings (IPOs), special purpose acquisition companies (SPACs), financings, workouts and restructurings. He also advises industry clients on general corporate matters, mortgage-backed securitizations, commercial lending transactions, company and asset portfolio acquisitions and dispositions, private equity transactions and other real estate-related transactions. David regularly represents special servicers, lenders and borrowers on loan restructurings, workouts and take backs. He has advised clients in transactions totaling more than $100 billion. David is the co-head of the US real estate practice and head of the New York real estate group.
- Best Lawyers in America, Real Estate Law, New York, Leading Lawyer, 2014-2025
- Chambers USA, Leading Lawyer for Real Estate: Corporate, New York
- Legal 500 US, Next Generation Partner for REITS; Recommended for Real Estate
- IFLR1000, Notable Practitioner for Real Estate in the US
- Law360, MVP: Real Estate, 2018
- Benjamin N. Cardozo School of Law, JD
- Yeshiva University, BS
- New York
Andrew Kummer
Andrew Kummer advises clients on complex structured finance and derivatives transactions, with a particular focus on asset-based lending, securitizations, trade receivables finance, and bespoke capital markets instruments. His practice spans a wide range of financial products and structures, including structured notes, warehouse facilities, forward flow arrangements, and receivables purchases and sales. He also frequently advises clients on interest rate, deal contingent, foreign exchange, and other bespoke hedging transactions, including related regulatory considerations under the Dodd-Frank Act and other financial reforms.
- Legal 500 US, Recommended, 2024-2025
- Brooklyn Law School, JD, cum laude
- Bucknell University, BA
- Centro de Lenguas Modernas – Universidad de Granada
- New York
Jonathan Ching
Jonathan Ching focuses his practice on innovative and complex structured finance transactions involving commodities, digital assets and all types of financial assets. Drawing on his experience as in-house counsel, he provides practical strategic advice to help clients navigate complex issues.
Jonathan advises emerging companies, financial institutions and investment managers on the use of blockchain, crypto assets and tokenization across the capital markets including token launches, market infrastructure, trading, clearing and settlement solutions. He also advises financial sponsors, institutional investors and non-profit organizations on documentation, custody and other considerations related to lending, pledging and holding digital assets.
- Chambers USA, Band 2, Capital Markets: Structured Products, 2022-2026; Derivatives, 2022-2025
- Legal 500 US, Recommended, 2025
- National Asian Pacific American Bar Association
- Leadership Council on Legal Diversity
- Fordham University School of Law, JD
- University of Southern California, BA, with honors
- New York

Ludwig Zesch
Ludwig Zesch berät deutsche und internationale Private-Equity-Fonds, Unternehmen, Debt-Fonds und Banken bei komplexen inländischen und grenzüberschreitenden Finanzierungen. Seine Tätigkeitsfelder umfassen Akquisitionsfinanzierungen, Direct Lending, Leveraged Buy-Outs und Unternehmensfinanzierungen.
Er verfügt über besondere Erfahrung bei der Begleitung von Akquisitionsfinanzierungen unter Einbeziehung verschiedener Fremdkapitalstrukturen, einschließlich Unitranche/Super-Senior-Strukturen.
Vor seinem Eintritt bei McDermott war Ludwig Zesch mehrere Jahre in anderen führenden internationalen Rechtsanwaltskanzleien mit demselben Beratungsschwerpunkt in München und Frankfurt tätig.
Ludwig Zesch ist Co-Autor eines umfassenden Kommentars zu englischsprachigen Kreditverträgen für Leveraged Buy-Outs nach deutschem Recht (Acquisition Finance Agreements in Germany).
Ludwig Zesch beriet:
- OLB bei der Finanzierung der Übernahme der Blasius Schuster Group durch AUCTUS
- Rantum Capital als Kreditgeber bei der Refinanzierung der NOBIX Group
- Main Capital Partners bei dem Erwerb und der Finanzierung des Erwerbs einer Mehrheitsbeteiligung an der EIKONA AG
- JUVE Handbuch Wirtschaftskanzleien, Empfohlen: Kredite und Akquisitionsfinanzierung, 2025-2026
- Handelsblatt/Best Lawyers™, „Einer der führenden Anwälte“ in Deutschland: Bank- und Finanzrecht, 2023-2027
- IFLR1000, Banking and Finance, 2023-2026
- IFLR1000, „Rising Star“: Banking and Finance, 2022
- Legal 500 Deutschland, Empfohlen: Bank- und Finanzrecht, 2025
- sdw Alumni e.V. (Verein der ehemaligen Stipendiatinnen und Stipendiaten der Stiftung der Deutschen Wirtschaft)
- Recht und Wirtschaft in Bayreuth e.V. (RW Alumni)
- Deutsch-Polnische Juristen-Vereinigung e.V.
- Oberlandesgericht Frankfurt, Zweites Staatsexamen
- Wirtschaftswissenschaftliche Zusatzausbildung (Wirtschaftsjurist (Univ. Bayreuth)), Erstes Staatsexamen
- Universität Bayreuth
- Deutschland
- Deutsch
- Englisch
- Polnisch

James M. Nicholas
James (Jim) Nicholas focuses his practice on federal and state labor and employment issues and litigation for life sciences, tech, private equity and portfolio companies. He is sought after to handle high-stakes matters relating to employee classification, wage and hour, leaves of absence, discrimination and harassment, wrongful termination and the enforcement of noncompetition and nondisclosure agreements, especially in Massachusetts and California.
Jim is an experienced litigator, frequently defending employers against wage and hour class actions brought under the Fair Labor Standards Act and state wage and hour laws. He represents employers in cases involving claims of discrimination and harassment, breach of contract, defamation, noncompetition defense and enforcement, and shareholder disputes.
- Obtained dismissal of a nationwide wage and hour class action based on enforceability of arbitration agreements applicable to named class representatives*
- Obtained summary judgement in favor of staffing agency involving claims by former executive for breach of contract and violation of the Massachusetts Wage Act*
- Advised private equity and strategic buyers and sellers on labor and employment matters in transactions across industries such as technology, staffing, healthcare, logistics, robotics, biotech and pharmaceuticals*
*Matter handled prior to joining the firm.
- Best Lawyers in America, Employment Law – Management, 2022-2023 and 2025-2026
- Legal 500 US, Labor and Employment Disputes, 2024-2025
- Massachusetts Super Lawyers, “Rising Star,” 2005-2012 and 2016
- Hingham Youth Football, Coach/Advisor
- Hingham High School Football and Lacrosse Boosters, 2021-2022
- University of Maryland Francis King Carey School of Law, JD, Order of the Coif
- State University of New York at Geneseo, BA
- Massachusetts
- US Court of Appeals for the First Circuit
- US District Court for the District of Massachusetts

Dr. Felix Ganzer
Dr. Felix Ganzer leitet unsere deutsche Kapitalmarktpraxis und berät darüber hinaus regelmäßig Private Equity Investoren auf Kauf- und Verkaufsseite.
Im Kapitalmarktrecht begleitet er Emittenten, Banken und Investoren bei Börsengängen (einschließlich Dual Track Transaktionen und De-SPACs), Ankerinvestitionen, Bezugsrechtsangeboten und Block Trades. Sein Beratungsgebiet umfasst die volle Bandbreite an Eigen- und Fremdkapitalinstrumenten, Compliance-Fragen sowie komplexe gesellschaftsrechtliche Fragestellungen.
Zudem berät Felix Ganzer regelmäßig internationale Private Equity Investoren bei Kauf- und Verkaufsmandaten, insbesondere zu grenzüberschreitenden Transaktionen. Er verfügt über besondere praktische Erfahrung in Bezug auf Buy-Outs, öffentliche Übernahmen und komplexe Carve-Out Transaktionen.
Felix Ganzer beriet:
Kapitalmarktrecht
- Main Capital Partners beim Erwerb der im Freiverkehr notierten VOQUZ Labs AG, einschließlich anschließendem Squeeze-out
- AUA Private Equity beim Verkauf der Portfoliogesellschaft Bistro MD an die im Prime Standard notierte Marley Spoon Group, einschließlich Rückbeteiligung
- Tether, den globalen Marktführer im Bereich Stablecoins, beim Erwerb einer Mehrheitsbeteiligung an der im Freiverkehr notierten Northern Data AG im Wege mehrerer Kapitalerhöhungen über insgesamt EUR 0,7 Mrd., einschließlich Zeichnung und Wandlung einer Wandelanleihe
- The Legal 500 EMEA, Empfohlen, Deutschland: Gesellschaftsrecht und M&A, 2024
- Oberlandesgericht Hamm, Zweites Staatsexamen
- Universität Münster, Dr. jur.
- Universität Münster, Erstes Staatsexamen
- Deutschland
- Deutsch
- Englisch