Parker A. Lee focuses his practice on mergers and acquisitions, project development and joint ventures in the energy and infrastructure industries. He has experience working with petrochemical companies, refiners, storage and logistics companies, midstream developers and operators, exploration and production companies, project developers, and financial investors on complex projects and transactions in the upstream, midstream and downstream sectors, as well as with traditional infrastructure such as tollways and bridges. Parker particularly has significant experience with complex midstream and downstream projects and with assisting clients in new energy matters involving renewable fuels, renewable natural gas, carbon capture, ammonia, hydrogen, helium and carbon offtake. He has also led or advised on numerous breakthrough renewable fuel transactions.
- Representing a major alcohol and spirits company in connection with a prospective Carbon Dioxide Purchase and Sale Agreement (including related environmental attributes) with a major industrial gas supplier related to a renewable natural gas facility adjacent to the company’s whiskey distillery
- Represented Enfinity Global Inc. in its sale of a 40% minority stake of its 400 MW U.S. operating portfolio, consisting of 28 operational solar PV power plants located in California, North Carolina and Idaho, to Japanese utility Kyushu Electric Power Co. Inc.
- Represented a public oil and gas company focused on the midstream and downstream sectors in its $265 million acquisition of substantially all of a Sacramento, California based petroleum distribution company focused on a wide array of petroleum products, including gasoline, low sulfur diesel fuel and renewable diesel or biodiesel
- Chambers USA, Energy: Oil & Gas (Transactional)-USA-Nationwide, Up and Coming, 2023
- The Legal 500 US, Next Generation Partner in Energy Transactions: Oil and Gas, 2023
- The Legal 500 US, Mergers & Acquisitions, 2015
- Institute for Energy Law, member
- Rocky Mountain Mineral Law Foundation, member
- Texas Exes
- New York Chapter, member
- Westchester County/Fairfield County Chapter, lead representative
- SMU Dedman School of Law, JD, cum laude
- The University of Texas at Austin, BBA
- New York
- Texas
- English
- French
- Spanish

David M. Wolff
David Wolff is the co-head of the US real estate practice and head of the Chicago real estate group. He represents private equity sponsors, real estate investment trusts, developers, capital providers and other institutional and non-institutional investors in commercial real estate, real estate finance and other related transactions. David advises clients in the structuring, negotiating and documenting of all aspects of commercial real estate transactions, including financing, acquisitions and dispositions, joint ventures, leasing and development of various property types located throughout the US.
- Represented a leading private equity firm in its more than $1 billion acquisition of 15 new development multifamily apartment communities located throughout the U.S.
- Represented a leading private equity firm in a strategic series of sequenced sales of a portfolio of 9 hotels located throughout the U.S. with aggregate transaction value in excess of $310 million
- Represented a leading private equity firm in a strategic series of complex sequenced sales of 22 senior living communities, with aggregate transaction value of $190 million
- Represented a leading private equity firm in the $194 million sale of a portfolio of 3 U.S. student housing properties
- Represented a leading private equity firm in the $97 million sale of a portfolio of 3 U.S. multi-family apartment communities
- Chambers USA, 2024-2026
- Legal 500 US, Recommended, 2015-2025
- Connect CRE, Lawyer in Real Estate Award for the Chicago & Midwest region, 2025
- American Bar Association, member
- University of Chicago Law School, JD
- University of Southern California, BA, cum laude
- Illinois

Simon Airey
Simon Airey focuses his practice on global, cross-border and internal investigations, financial and regulatory crime, bribery and corruption, money laundering, tax and fraud inquiries, data breaches, dawn raids, asset tracing, international enforcement and corporate compliance issues. Simon serves as co-head of McDermott Will & Schulte’s global investigations and compliance practice.
He has conducted a wide range of investigations and corporate defence assignments in different sectors, including construction, defence, financial services, gambling, oil and gas, logistics, pharmaceuticals and telecommunications. Simon represents both companies and individuals in criminal and regulatory proceedings and in associated litigation.
Simon advises a large number of multinational groups on their global compliance programs and assists clients with corporate risk assessments and pre- and post- M&A due diligence. He conducts tailored training for boards and senior management and has lectured around the world on a range of topics including the UK Bribery Act and the UK Criminal Finances Act. He advises a number of organisations on the corporate criminal offence of failing to prevent the facilitation of tax evasion and served on the UK Law Society committee which devised related guidance for the legal profession.
- HMRC -v- Micro Fusion, Court of Appeal [2009] EWHC 1082 (Ch)*
- HMRC -v- Halcyon Films LLP, Court of Appeal [2010] EWCA Civ 261*
- Sheikh Mohammed Hussein Al Amoudi -v- Elias Kifle & The Ethiopian Review [2013] EWHC 293 (QB)*
- R (on the application of Soma Oil & Gas Ltd) -v- Director of Serious Fraud Office (CO / 4022 / 2016)*
*Matter handled prior to joining the firm
- The Best Lawyers in the United Kingdom, Criminal Practice, 2023-2025
- Legal 500 UK, Leading Partner, Regulatory Investigations and Corporate Crime, 2021-2027
- Chambers UK, Corporate Crime & Investigations , 2022-2027
- Global Investigations Review’s GIR 100, Recommended, 2023-2024
- Who’s Who Legal, ‘Global Leader’ – Investigations, ‘Thought Leader’ – (1) Investigations, (2) Business Crime Defence and (3) Asset Recovery, 2021
- Acritas, ‘Star Lawyer’, 2017
- University of Sheffield, LLB, Honours
- England and Wales

Sam Siegfried
Sam Siegfried is a trusted advisor on emerging healthcare technology matters, with a particular focus on data privacy and security, artificial intelligence (AI), clinical research, and complex technology transactions. He helps healthcare and life sciences companies navigate evolving regulations, maximize data-driven opportunities, and implement innovative technologies. He also conducts privacy and research diligence and negotiates transition services agreements for mergers and acquisitions, strategic investments, and joint ventures.
With extensive experience in key privacy frameworks, including the Health Insurance Portability and Accountability Act (HIPAA), the California Consumer Privacy Act (CCPA), Washington’s My Health My Data Act (MHMDA), the General Data Protection Regulation (GDPR), and other evolving US and global data protection frameworks, Sam provides critical data strategy guidance to digital health platforms, genomic sequencing providers, health systems, biotech firms, and other health and life sciences organizations.
As AI reshapes healthcare delivery and innovation, Sam works closely with AI developers and deployers on AI governance programs, generative AI use, and consumer protection risks. In the clinical research space, he advises on federal and state research regulations, research compliance program development, research informed consent, and Institutional Review Board (IRB) requirements.
- Best Lawyers: Ones to Watch in America, Health Care Law, 2026-2027
- Lexology Data 100, Recommended, 2026
- Member, Board of Directors, Illinois Association of Healthcare Attorneys, 2019 – present
- Loyola University Chicago School of Law, JD, cum laude
- Loyola University Chicago, BA, cum laude
- Illinois
Anne Cox-Johnson
Anne Cox-Johnson advises public and private companies in a variety of complex transactions, including acquisitions and divestitures, joint ventures, strategic investments, carve-outs, recapitalizations, going-private transactions and special committee representations. She represents clients in various industries, including food and beverage, technology, pharmaceuticals, restaurants, telecommunications, consumer products, healthcare, manufacturing, real estate and retail. Anne also represents private equity funds in control and non-control investment transactions and investment exit transactions.
- Represented Bronya Shillo, All Night Long Inc. and All Night Long, LLC, in the sale of the Fishers Island Lemonade brand (a leader in the premium ready-to-drink alcohol category) and related assets to E & J Gallo Winery
- Represented Campari Group in its purchase of an initial 70% interest – with an option to acquire the remaining 30% interest – of the outstanding capital of Wilderness Trail Distillery, LLC
- Represented The Coca-Cola Company in connection with the sale of certain US production facilities to Refresco
- Represented The Coca-Cola Company in connection with its entry into a global relationship with Brown-Forman Corporation to bring Jack & Coke as a branded, ready-to-drink (RTD) pre-mixed cocktail to market
- Represented The Coca-Cola Company in connection with its USD1.02 billion sale of its bottling operations in Vietnam and Cambodia to Swire Pacific Ltd.
- Represented Anderson Holdings in the sale of its wholesale beverage distribution business in the US and British Virgin Islands to Clare Holdings LLC
- Represented a private company in connection with a USD4 billion self-tender offer
- Best Lawyers in America, Corporate Law, (2027), Leveraged Buyouts and Private Equity Law, Mergers and Acquisitions Law, 2023-2027
- Chambers USA, Corporate/M&A, 2024-2026
- Legal 500 US, Recommended, 2023 and 2025
- Georgia Diversity Council, Georgia’s Most Powerful and Influential Women, 2014
- American Bar Association, member
- Georgia Bar Association, member
- New York State Bar Association, member
- Vanderbilt University, JD, Order of the Coif
- University of Tennessee, BA
- Georgia
- New York

Lindsay Heyen
Lindsay Heyen concentrates her practice on the tax aspects of complex business and investment transactions, with a particular focus on single-family offices and private investment funds, and transactions involving partnerships and limited liability companies, such as acquisitions, divestitures, investments, joint ventures and restructurings.
- Represented multiple Forbes 100 clients in connection with the formation of management companies and family offices, private investment funds and related incentive equity planning for employees
- Represented a client in a multi-billion dollar divestment of manufacturing and logistical assets*
- Acted as lead counsel in a major joint venture (partnership) formation for development of an offshore pipeline*
- Best Lawyers: Ones to Watch in America, Tax Law, 2026-2027
- Chambers High Net Worth, Nationwide: Family Offices & Funds Structuring, 2025-2026
- Stanford Law School, JD, e
- Arizona State University, BA, summa cum laud
- Illinois
- California
- Texas

Douglas H. Carsten
Leads complex patent litigation disputes, with an emphasis on high-stakes trial work
Represents clients in pharmaceutical and life sciences patent matters, including Hatch-Waxman disputes
Handles patent disputes across a broad range of technologies, including medical devices and consumer products
Doug Carsten is co-head of the firm’s global Intellectual Property Group and the go-to lawyer to take high-profile and billion-dollar patent cases to trial.
- Secured Federal Circuit victories for Viatris (formerly Mylan) on four appeals affirming several PTAB decisions invalidating five different Sanofi patents related to Sanofi’s Lantus SoloSTAR insulin glargine product. Doug argued all four appeals on the same day, which was the culmination of four years of work paving the way for Viatris to commercialize Semglee, a lower-cost version of Lantus SoloSTAR, which made history as the first approved interchangeable biologic. (Sanofi-Aventis Deutschland GmbH v. Mylan Pharmaceuticals Inc)
- Secured a Federal Circuit reversal of a patent term adjustment decision that cost his clients more than a year and a half of patent term relating to the oral pulmonary hypertension drug Orenitram, invalidating a US Patent and Trademark Office (USPTO) regulation that the Federal Circuit had previously affirmed as reasonable (Supernus et al. v. Iancu)*
- Secured a trial win on a patent relating to United Therapeutics’ flagship product, Remodulin. United Therapeutics’ market capitalization increased approximately $1.2 billion during the trading day in which the US District Court for the District of New Jersey’s decision finding United Therapeutics patent valid and infringed under the doctrine of equivalents was released. (United Therapeutics v. Sandoz)*
- Obtained trial verdict finding an injector pen for delivering insulin products did not infringe Sanofi’s patent, and further finding the Sanofi patent invalid (Sanofi-Aventis v. Mylan (D. N.J.))*
- Invalidated two formulation patents relating to Sanofi’s blockbuster insulin glargine Lantus product (Mylan v. Sanofi-Aventis (PTO))*
- Best Lawyers in America, Litigation – Intellectual Property, 2027
- Daily Journal, Top Intellectual Property Lawyer, 2018-2026
- Chambers USA, Life Sciences: IP/Patent Litigation, 2025-2026
- Managing Intellectual Property, IP Stars, Patent Star, 2025-2026
- LMG Life Sciences, Leading Life Sciences Lawyer, 2021-2022
- Thomson Reuters, Stand-out Lawyer – independently rated lawyers, 2026
- IAM Patent 1000 – The World’s Leading Patent Practitioners, 2022-2025
- McDermott Will & Schulte Intellectual Property Group, co-head
- McDermott Will & Schulte Management Committee, member
- Georgetown University Law Center, JD, cum laude
- Harvard University, MA, Organic Chemistry
- State University of New York at Stony Brook, BS, Chemistry and English Literature, with departmental honors, summa cum laude
- California
- Supreme Court of the United States
- US Court of Appeals for the Federal Circuit
- 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
- US Patent and Trademark Office
- English

Nathan Bull
Nathan Bull focuses his practice on complex securities and commercial litigation in state and federal court, with an emphasis on corporate control contests, shareholder class actions and derivative suits, as well as matters involving complex financial instruments and structured products. Nathan regularly advises clients on matters regarding complex contractual disputes, merger litigations and activism-related litigation. Nathan also has extensive experience in a variety of regulatory matters and enforcement actions brought by various federal and state entities and regulatory bodies departments, including with respect to insider trading and market manipulation investigations.
- Represented a multi-billion dollar asset management firm in litigation commenced by stockholders in Delaware and New York challenging a merger transaction.*
- Represented an American pharmaceutical company in connection with a securities fraud class action alleging that the company engaged in a so-called “channel stuffing” scheme and misrepresented the inventory levels of its pharmaceutical products held at wholesalers*
- Represented a monoline insurer in connection with the Chapter 11 bankruptcy of a residential mortgage loan company and its affiliates, after representing the insurer in a four-year civil litigation against an affiliate to recover billions of dollars of losses arising out of financial guaranty insurance that it provided in connection with residential mortgage-backed securitizations*
- Super Lawyers, Rising Star 2015 and 2016
- Recipient of the Burton Award for exceptional legal writing
- New York University School of Law, JD
- University of Pennsylvania, BA
- New York
- Florida
- US Court of Appeals for the Second Circuit
- US Court of Appeals for the Fifth Circuit
- US District Court for the Southern District of Florida
- US District Court for the Southern District of New York

Jibin T. Luke
Jibin T. Luke represents business owners and investors with structuring and negotiating mergers and acquisitions, leveraged buyouts, energy transactions, equity investments and other general corporate matters. He regularly advises clients on domestic and international transactions, corporate governance matters, private debt and equity financing, regulatory matters and portfolio company investments.
Mergers and Acquisitions
- Represented a Chinese investment consortium in its US $1.2 billion acquisition of oil and gas assets in the Permian Basin from two private equity backed companies*
- Represented a Chinese investment consortium in its US $315 million acquisition of oil and gas assets in the Permian Basin from a private equity backed company*
- Represented a portfolio company of a private equity fund in the US $160 million sale of its oil and gas assets to a strategic buyer backed by a Chinese private equity fund*
- The Legal 500 US, Recommended, 2023
- Chambers USA
- Corporate/M&A, Texas
- Nationwide Energy: Oil & Gas
- American Bar Association Energy Law Section, member
- Rocky Mountain Mineral Law Foundation, member
- State Bar of Texas, member
- University of Houston Law Center, LLM, Taxation
- Texas Tech University, MBA
- Texas Tech University, JD
- Texas A&M University, BA
- Texas

Jack Langlois
Jack Langlois is the office managing partner for Houston. Jack focuses his practice on energy related matters, including upstream, midstream and downstream. He advises clients on investments in and financings of energy projects and assets, including, mergers, joint ventures and acquisitions and dispositions of assets and stock of energy companies. Jack represents public and private companies, private equity investors, lenders, governments and national oil companies in a number of substantial domestic and international corporate transactions. Jack advises on mineral exploration and development projects, including matters involving acquisition of exploration and development rights, pipelines, gathering, transportation, processing, storage, and other infrastructure.
- Represented Oasis Midstream in connection with preparation and negotiation of long-term gathering and processing agreement
- Represented a client in connection with negotiation of long-term ethane export purchase agreement
- Represented Todd Corporation in connection with negotiation of joint venture agreements and project agreements for development of methanol plant in Louisiana
- Represented Todd Corporation in connection with investment in LNG facility in Louisiana
- Represented a client in connection with purchase of securitized notes to fund acquisition of oil and gas wells
- Best Lawyers in America, Natural Resources Law, Oil and Gas Law, 2012-2026
- Chambers USA, Corporate/M&A and Energy: Oil & Gas (Transactional), 2022-2025
- Legal 500 US, Recommended, 2022-2025
- IFLR1000, Project Development, Project Finance, M&A, 2023
- American Bar Association Energy Law Section, member
- State Bar of Texas, member
- Louisiana State University Law Center, JD, honors
- University of Southwestern Louisiana, BA
- Texas
