Michael Hilkin represents clients in all aspects of complex state and local tax matters. He has a particular focus on tax controversy and transactional issues relating to state and local income, franchise, sales and use, gross receipts, and other business taxes. Michael has extensive experience handling state and local tax issues before US administrative and judicial systems, including arguing cases before state courts and state supreme courts. He also regularly advises clients on personal income tax issues, especially those concerning residency.

Michael frequently speaks on state and local tax issues before the Council on State Taxation, Tax Executives Institute, the New York University Institute on State Taxation, the Paul J. Hartman SALT Forum, and the Institute for Professionals in Taxation.

Stephen (Steve) P. Kranz is a tax lawyer who solves tax problems differently. Over the course of his extensive career, Steve has acquired specific skills and developed a unique approach that helps clients develop and implement holistic solutions to all varieties of tax problems. He combines strategic thinking with effective skills for the courtroom, the statehouse and the conference room.

Steve helps clients prevent and resolve tax problems throughout their life cycle, starting with tax planning, compliance, financial statement implication analysis, audit defense and litigation, legislative monitoring and advocacy, and the formation and leadership of taxpayer coalitions. Steve developed many of these techniques as a litigator for the US Department of Justice, Tax Division, as chief counsel for the District of Columbia’s Office of Tax and Revenue, and further refined them during his tenure as general counsel for the Council on State Taxation (COST).

Steve practices at the forefront of state and local tax issues, including developments in the world of cloud computing, artificial intelligence such as ChatGPT and digital goods and services. He helps clients understand tax threats and opportunities, and develop holistic solutions, no matter the tax issues or jurisdiction. He also brings this same skill set to the highly challenging world of unclaimed property.

Steve represents Fortune 100 companies in litigation while working to address the larger tax policy questions through state legislatures, the US Congress, the National Conference of State Legislatures, the National Governors Association, the Multistate Tax Commission and the Streamlined Sales Tax Governing Board. His background has taught him that standalone litigation is not always the most efficient manner of solving a tax problem or preventing its spread – thus, he often works to address problems by taking advantage of tax policy points of entry offered by state and local governments.

Steve has authored articles for professional publications, speaks at national conferences and is interviewed frequently by journalists covering state and local tax developments. He has appeared before the US House Judiciary Committee as an expert on alternative approaches to the Internet Sales Tax issues, and in a similar capacity before other government agencies. Steve serves as outside counsel on state tax and unclaimed property matters for the Entertainment Software Association, the National Retail Federation, the Retail Industry Leaders Association and CompTIA.

Shawn O’Brien is nationally recognized by his peers and clients as a leading tax practitioner with a focus on tax litigation and controversies involving state, federal and international tax authorities. Drawing on his 25 years of experience, Shawn represents clients in tax examinations and administrative appeals and, when necessary, serves as a forceful advocate in litigation before the US Tax Court, US district courts, the US Court of Federal Claims, state courts and federal appellate courts. Shawn is the managing partner for the firm’s Houston office.

Clients interviewed in the Chambers USA Legal Guide 2024 shared that Shawn is “a trusted adviser and his level of service is superb” and he “has been a good strategic tax partner for our company,” particularly noting his “in-depth knowledge of our industry.”

Shawn’s experience spans a broad range of tax issues that affect many different industries, including energy, renewables, financial services, life sciences, manufacturing, media and entertainment, technology and aviation. He advises domestic, foreign and multinational corporations, partnerships, master limited partnerships, real estate investment trusts and limited liability companies on tax issues in connection with foreign and domestic transactions.

He also counsels clients in disputes involving transfer pricing, debt versus equity, loss carrybacks, international withholdings, advance pricing agreements, tax shelter disallowances, research and development tax credits, changes in accounting methods, captive insurance, related-party transactions, repatriation structures, inbound distributors, foreign credit transactions and penalty abatements. Shawn has also developed a market-leading federal and state excise tax practice that advises some of the largest corporations on excise tax planning and controversies.

Sebastian Orozco advises high-net-worth individuals, families, and fiduciaries on sophisticated US and cross-border estate, gift, and income tax matters. His practice encompasses international estate planning, foreign and domestic trust planning, structuring US and foreign investments, wealth preservation, and U.S. tax compliance. 

Sebastian has particular experience with preimmigration and expatriation planning. He counsels clients on trust classification and distribution issues, restructuring strategies involving gifts, grantor and nongrantor trusts, and cross-border holdings, and expatriation tax consequences. He also assists US beneficiaries and families with foreign trusts, foreign estates, reporting obligations, and the tax-efficient transfer of wealth across generations and borders. 

Sebastian writes and speaks on cross-border private client planning, pre-immigration and expatriation. Prior to McDermott, he served as a judicial law clerk at the US Tax Court. He earned an LL.M. in Taxation with honors from Georgetown University.