Samantha R. Koplik focuses her practice on leveraged finance transactions for private equity firms, strategic buyers, institutional investors, biotech/pharma companies, private debt funds and other providers and consumers of debt financing. She advises clients on a broad range of domestic and cross-border financing transactions, including acquisition financing, recapitalizations, strategic capital raises, restructurings and exits. She also provides general financing and corporate advice to a number of private equity portfolio companies and other operating companies across various industries in the United States and multiple other jurisdictions.
- Represented Court Square Capital Partners in its majority investment in Thrive Operations, a leading provider of technology managed services, from M/C Partners, and several domestic and cross-border add-on acquisitions to Thrive’s platform*
- Represented Court Square Capital Partners in its recapitalization of The Evans Network of Companies, a leading non-asset based logistics services company*
- Represented Court Square Capital Partners in its acquisition of Advanced Diabetes Supply, a leading national distributor of durable medical equipment for diabetes patients, and ADS’s subsequent acquisition of US Medical Supply, a home delivery medical services company, from H.I.G. Capital*
- The Legal 500 US, Private Equity and Commercial Lending
- IFLR1000, Banking and Capital Markets: Debt, 2022-2023
- Private Equity International (PEI), Future 40, 2021
- Euromoney, Rising Star, 2017-2018
- American Bar Association, member
- New York State Bar Association, member
- Association of the Bar of the City of New York, member
- New York University School of Law, JD
- Vassar College, BA
- New York

Zachary Sproull
Zachary Sproull represents clients in connection with investigations and complex litigation involving antitrust, consumer protection and unfair competition matters. He has represented clients across a variety of industries including financial services, consumer products, food and beverages, tech, healthcare, construction materials, retail and electronics.
- Navigated internal investigations in response to government investigative requests and in anticipation of proposed mergers
- Defended international electronics-industry client in consumer class actions alleging multi-year price-fixing conspiracies involving multiple products*
- Defended financial-services industry client in class action involving alleged conspiracy to block entry of new service providers in markets for financial products*
- Best Lawyers: Ones to Watch in America, Antitrust Law, 2027
- Fordham University School of Law, JD
- Colgate University, BA, cum laude
- New York
- US District Court for the Southern District of New York

Dr. Johannes Honzen
Dr. Johannes Honzen advises national and international companies as well as private equity and other financial investors on real estate matters, in particular on real estate transactions and joint ventures, as well as on corporate law and M&A projects.
He has significant experience in complex single-asset and portfolio transactions by way of asset deals, share deals, or joint venture structures. In recent years, Johannes Honzen has been involved in a large number of major real estate transactions in various asset classes and, in this context, has primarily advised large international real estate funds as well as national companies on all aspects of real estate and corporate law, including project developments.
Prior to joining McDermott Will & Schulte in January 2022, Johannes Honzen worked for a leading German law firm in Frankfurt, Munich, and London in the areas of real estate, M&A, and private equity.
Johannes advised:
- KKR and Mirastar, the European industrial and logistics platform of KKR Real Estate, on the acquisition of a logistics property in Hanover. The transaction is the first acquisition by KKR and Mirastar in this asset class in Germany and also the first German acquisition for KKR’s pan-European Core+ Real Estate strategy.
- VR Equitypartner (VREP) on the acquisition of a significant minority stake in Midoco Holding GmbH
- DEMIRE on the sale of an office property to a company of the Merckle group
- The seller on the sale of the living property Fürstenhöfe in Düsseldorf to CT Real Estate Partners Germany
- Blackstone on acquisitions and sales of major single assets and real estate portfolios in various asset classes as well as asset management matters, in particular, on the acquisition of the Oberbaum City and the Leibniz-Kolonnaden in Berlin and the Arabella Bogen in Munich as well as on the sale of the Munich project MediaWorks and the ABC Bogen in Hamburg*
- KKR on the acquisition of a majority stake in Velero together with a residential portfolio*
- Cara Investment on the sale of the BHF Tower in Frankfurt*
- A leading international real estate investor on the acquisition of a logistic portfolio*
*Matter handled prior to joining the firm
- Handelsblatt/Best Lawyers™, Germany: Real Estate Law, 2026-2027
- Handelsblatt/Best Lawyers™, “Ones to Watch” in Germany: Private Equity Law, Real Estate Law and Mergers and Acquisitions Law, 2022-2025
- The Legal 500 EMEA, Recommended, Germany: Real Estate Law, 2023-2024
- Frankfurt Bar Association
- University of St. Gallen, Executive Diploma HSG in Law and Management
- Higher Regional Court of Frankfurt, Second State Exam
- University of Bayreuth, Dr. jur.
- University of Bayreuth, First State Exam
- University of Bayreuth, Commercial Lawyer (Wirtschaftsjurist (Univ. Bayreuth))
- Germany
- English
- German

Sarah J. Fischer
Sarah J. Fischer focuses her practice on intellectual property patent litigation and patent licensing disputes, particularly for life-science, pharmaceutical and high-tech clients, in district court and before the PTAB, on behalf of both patent holders and defendants/petitioners. She handles all facets of pretrial discovery, case management and trial preparations. Sarah also counsels clients on due diligence, pre-suit matters and claim drafting strategies.
Sarah clerked for Chief Judge Ron Clark of the United States District Court for the Eastern District of Texas.
- Represented start up pharmaceutical company in post-grant proceedings*
- Defended generic pharmaceutical company in several suits related to ADHD medications*
- Represented patent owner through trial on matters related to encryption*
- Patexia, Top Hatch-Waxman Litigator, 2024
- Best Lawyers: Ones to Watch in America, Litigation – Intellectual Property, 2025-2027
- Super Lawyers, Rising Star, 2018 to present
- Suffolk University Law School, JD, Chemistry, summa cum laude
- Boston University, MA, Chemistry, summa cum laude
- University of Massachusetts Lowell, BS, Minor in History
- Massachusetts
- New York
- US Patent and Trademark Office
- US District Court for the District of Massachusetts
- US District Court for the Eastern District of Texas

Bradley R. Burcroff
Bradley (Brad) R. Burcroff focuses his practice on representing private equity sponsors and their portfolio companies, as well as other private companies, in complex business transactions, including mergers, acquisitions, and divestitures; leveraged buyouts; cross-border transactions; corporate carve-outs; joint ventures; minority investments; financings; reorganizations; and corporate governance matters.
- Represented Kingswood Capital Management in its public-company carve-out acquisitions of Progress Lighting and Kichler Lighting
- Represented Kingswood Capital Management in its public-company carve-out acquisition of Identity Theft Guard Solutions
- Represented Thomas H. Lee Partners in its acquisition of Headlands Research a leading multinational network of clinical trial sites, from funds managed by KKR
- Chicago-Kent College of Law, JD
- Northeastern University, BA
- Florida
- Illinois
- Texas (inactive)

Jason Leonard
Jason Leonard is a prominent intellectual property trial lawyer and litigator based in New York City. He brings a unique combination of deep scientific expertise and extensive courtroom experience to high-stakes life sciences and patent disputes. During his nearly 20 years of practice, he has represented numerous companies looking to resolve disputes though both litigation and arbitration. Jason’s legal experience spans all stages of dispute resolution, including pre-suit investigations, multiple-defendant litigations, and appeals. In developing trial and litigation strategies, he uses his passion for science and mastery of pharmaceutical research and development to simplify the intricacies of drug development into concise and compelling narratives for trial.
- Represented Astellas against nine defendants in Astellas v. Actavis relating to polymorph and method of treatment patents covering Myrbetriq® (a β3-agonist for the treatment of overactive bladder). Cases settled very favorably for Astellas*
- Successfully represented Astellas relating to an IPR petition filed by Sawai concerning a compound patent covering Myrbetriq® (a β3-agonist for the treatment of overactive bladder). The PTAB did not institute the petition*
- Successfully represented Sanofi in Sanofi v. Fresenius relating to a compound patent covering Jevtana® (a taxane chemotherapy agent for docetaxel-resistant prostate cancer). Sanofi prevailed at trial on the compound patent and injunction obtained*
- Chambers USA, 2026
- Patexia, Top Hatch-Waxman Litigator, Top 50, 2024
- Legal 500 US, Intellectual Property: Patents: Litigation (Full Coverage), Recommended, 2020
- University of New Hampshire Franklin Pierce School of Law, JD, cum laude
- University of Connecticut, BS, Chemistry, cum laude
- New York
- New Jersey
- Supreme Court of the United States
- US Court of Appeals for the Federal Circuit
- US District Court for the District of New Jersey
- US District Court for the Southern District of New York
- US District Court for the Eastern District of New York

Ari Edelman
Ari is a global transactions partner in McDermott’s capital markets group. Ari focuses on a variety of corporate finance transactions, including U.S. and cross-border capital markets transactions, mergers and acquisitions, securities regulation, and corporate governance for public and private companies. Ari represents operating companies, investors and investment banking firms in a wide variety of corporate finance transactions. Ari also advises clients on fiduciary duties, corporate governance, executive compensation and disclosure compliance. Ari’s clients are located, and/or transact, across the globe in a broad range of industries, including life sciences, healthcare, real estate, asset management, technology, energy, and entertainment. Ari’s roster of clients includes numerous publicly traded companies, numerous global financial services firms and several venture capital firms.
- The Legal 500 US, Recommended, 2023
- Fordham University School of Law, JD, summa cum laude
- Yeshiva University, BA
- New York

Simon Roberts
Simon Roberts focuses his practice on patent litigation in the life sciences and biotechnology sectors. He has nearly 30 years of experience practicing law in both the US and Europe. Simon leverages his background in chemistry to translate complex technical issues into relatable terms for clients.
- Served as lead counsel for Astellas Pharma in patent infringement suit filed against 20+ generic companies involving the formulations found in their leading drug for the treatment of overactive bladder*
- Served as lead counsel for Astellas Pharma in multiple district court cases against nine generic groups asserting infringement of patents that cover Astellas’s Myrbetriq® product*
- Served as lead counsel for a major seed manufacturer to successfully assure its major competitor respected its plant certificates covering the market-leading melons*
- Legal 500 US, Intellectual Property, 2020 and 2024-2025
- Patexia, Top Hatch-Waxman Litigator, 2024
- Inns of Court School of Law, London, Barrister at Law
- University of Exeter, BA Law, with honors
- University of Exeter, BSc Chemistry & Law, with honors
- New York
- US Patent and Trademark Office
- US Court of Appeals for the Federal Circuit
- US District Court for the Southern District of New York
- US District Court for the Eastern District of New York

Rachel Rosen
Rachel Rosen focuses her practice on public finance matters with an emphasis on derivatives, structured products and creditors’ rights, and has worked on both taxable and tax-exempt financings across the US. Rachel’s representation experience includes financial institutions, municipal housing agencies, servicers and private tax lien purchasers.
- New York State Bar Association
- American Bar Association
- National Association of Bond Lawyers
- Benjamin N. Cardozo School of Law, JD
- University of Michigan, BA
- New York
- Connecticut

Giancarlo Castorino
Real estate finance
Acquisition finance
Corporate finance
Cross-border lending transactions
Restructurings and distressed debt portfolios
Giancarlo Castorino advises on a wide range of finance matters, with particular emphasis on real estate and acquisition finance in domestic and cross-border transactions.
He represents all of the leading Italian banks, international banks and investors on complex financings, restructurings and distressed debt portfolio matters.
His practice is closely tied to the Italian market, where he built McDermott’s banking and transactions capabilities in Milan.
- Loan to a closed-end real estate fund supporting social housing, student housing and urban redevelopment projects in Lombardy, backed through European Investment Bank financing
- Approx. €1 billion refinancing for a flagship Milan real estate development involving a sovereign investor and a leading Italian real estate operator
- Approx. €400 million senior facility for a major Rome real estate complex and fit-out program for a leading Italian energy company
- Chambers Europe, Italy: Real Estate: Finance, 2023-2024
- Legal 500 EMEA, Hall of Fame, Italy: Banking and Finance, 2023-2026
- The Best Lawyers in Italy, Banking and Finance Law and Real Estate Law, 2015-2025
- Who’s Who Legal, Global Leader, Banking & Finance, 2023
- Who’s Who Legal, National Leader, Italy, Banking & Finance, 2022
- Chambers Global, Leading individual in Banking & Finance in Italy, 2020
- Office managing partner, Milan, McDermott
- University of Messina
- Milan
- Supreme Court of Cassation
- Supreme Court of Cassation
- Italian
- English
