small-logo
ProfessionalsCapabilitiesInsights & NewsCareersLocations
About UsAlumniOpportunity & InclusionPro BonoCorporate Social Responsibility
Stay Connected:
facebookinstagramlinkedintwitteryoutube
  1. Professionals

John Arszulowicz

he/him/his

Associate

Washington, DC

+1 202-282-5081

Let's Connect

Email
vCard
  • Full Bio PDFPDF
    • Email
    • LinkedIn
    • Facebook
    • Twitter
    Share this page
  • Overview
  • Experience
  • Credentials
  • Insights & News

John is a highly skilled tax and government investigations attorney with a broad range of experience in tax law, corporate finance, government contracts, government investigations, and international trade.

John represents clients across a variety of industries through all phases of administrative tax controversy and litigation, with particular emphasis on highly complex cross-border and multi-jurisdictional issues. John brings a comprehensive understanding of tax law and government investigations, leveraging extensive experience from both the government and private sectors.

John is a United States Air Force Veteran and maintains an active pro bono practice supporting veterans to obtain needed service-connected disability benefits. John served at the only Federal Pro Bono Program for Veterans created by Congress in 1992. He served as an intern and volunteer for The Veterans Consortium PTSD/TBI Discharge Upgrade Program. John also advocated on behalf of a Purple Heart recipient and obtained service-connected disability benefits for the veteran while supporting the National Veterans Legal Services Program.

John volunteers to help those most in need and, in the past, spent his weekends building homes for the Habitat for Humanity housing program and volunteered his time to serve meals to the DC community supporting the So Others Might Eat (SOME) meals program.

Before joining Winston, John was a tax attorney for the Internal Revenue Service (IRS) Office of Chief Counsel, Procedure and Administration. He also previously served as Assistant Counsel with the U.S. Department of the Navy, and was an associate at various international law firms, where he practiced in a variety of areas including tax, corporate finance, government contracts, government investigations, and international trade.

While in law school, John interned at the U.S. Department of Justice, Marshals Service, Office of General Counsel and at the U.S. Department of Labor, Office of the Solicitor.

Key Matters

Some of the experience represented below may have been handled at a previous firm.

Tax Controversy, Tax Planning, Mergers & Acquisitions – REPRESENTATIVE MATTERS
  • Assisted with the litigation of multi-million tax refund claim.
  • Assisted clients with complex IRS audits.
  • Assisted with litigation on the foreign earned income exclusion for the Joint Defense Facility Pine Gap (JDFPG) matter.
  • Assisted U.S. Department of Justice, Tax Division on Freedom of Information Act (FOIA) dispute regarding access to taxpayer information.
  • Defended IRS audit of US$16M stock charity donation and procured a no change letter.
  • Advised IRS LB&I on the reopening of a multinational taxpayer audit for previous tax years.
  • Advised IRS LB&I on privileges for transfer pricing valuation documents.
  • Advised on SALT tax implications for multimillion-dollar M&A deals.
  • Advised on SALT tax implications on the sale of renewable energy tax credits.
Corporate Finance, Fund Finance, Real Estate, Crypto – Representative Matters
  • Assisted clients on subscription-secured credit facilities.
  • Closed 20+ cross-border finance transactions and fund finance deals ranging from US$50M–US$1.5B.
  • Assisted financial institutions and corporate clients in connection with the negotiation and documentation of commercial, asset-based, project-related, and real estate loan transactions, as well as advising clients on legal issues arising in complex single and multi-lender loan restructures.
  • Assisted foreign and domestic institutional lenders in various forms of secured and unsecured finance transactions including subscription finance, syndicated lending, corporate finance, and leveraged finance.
  • Advised a Fortune 500 company finance division on commercial debt collection procedures and licensing requirements.
  • Represented client on non-fungible token (NFT) opinion letter addressing securities classification and regulatory requirements to operate an online NFT marketplace.
  • Assisted digital currency platform with Office of the Comptroller of the Currency (OCC) regulatory requirements and licensing procedures to establish a national bank.
  • Represented major financial institutions and hotel franchises on receivership proceedings.
FALSE CLAIMS ACT, GOVERNMENT CONTRACTS, GOVERNMENT INVESTIGATIONS – rEPRESENTATIVE MATTERS 
  • Represented the U.S. Department of the Navy (DON) on 41 suspension and debarment proceedings under FAR § 9.4.
  • Represented the DON on parallel government economic crimes investigations.
  • Assisted with government False Claims Act (FCA) investigations for DoD contracts including cross border investigations with federal law enforcement agencies, Offices of the United States Attorneys, and Fraud Section of the Department of Justice Civil Division.
  • Assisted DoD contractor with FCA investigation alleging Procurement Integrity Act (PIA) violations and bid rigging allegations.
  • Advised the DC District Court and served as a U.S. Department of Justice advisor to then Chief Judge Royce Lamberth, Senior Judge Kollar-Kotelly, and Judge Henry Kennedy on matters involving the Classified Information Procedures Act (CIPA), DOJ credentialed official with a Top Secret/Sensitive Compartmented Information (TS/SCI) clearance.
  • Represented the U.S. Food and Drug Administration (FDA) National Headquarters and the FDA Office of Regulatory Affairs (ORA) on pharmaceutical and Center for Food Safety and Applied Nutrition (CFSAN) field inspections, FDA Credentialed Official.
  • Assisted with litigation and trial preparation regarding kickback allegations on a U.S. Department of Labor Employee Benefit Plan matter.
INTERNATIONAL TRADE, SANCTIONS, 301 TARIFFS, CUSTOMS, International Trade Administration, and International Trade Commission – REPRESENTATIVE MATTERS
  • Assisted with representation in a variety of trade remedy cases, including antidumping and countervailing duty proceedings before the U.S. Department of Commerce, International Trade Administration, and International Trade Commission.
  • Advised clients on import, export, and sanctions laws, including country of origin and substantial transformation compliance questions.
  • Assisted clients on custom issues including tariff classification disputes.
  • Submitted Section 301 Tariff Exclusions on behalf of domestic businesses impacted by the 301 duties.
Additional Areas – Representative Matters
  • Assisted with litigation and obtained a settlement for a DC source of income discrimination matter.
  • Advised on distribution of Personal Protective Equipment under an emergency use authorization (EUA) during the COVID-19 public health emergency (PHE) declared under section 319 of the Public Health Service (PHS) Act.
  • Advised the U.S. Marshals Service on Federal Tort Claims Act (FTCA) damage claims against the government.

  • 2017 Gary S. Tell ERISA Litigation Scholar
  • U.S. Department of Justice J-Stars Award
  • U.S. Food and Drug Administration Commissioner’s Special Citation Award
  • U.S. Food and Drug Administration Group Recognition Award
  • U.S. Food and Drug Administration Leveraging Collaboration Award
  • U.S. Food and Drug Administration Team Excellence Award
  • United States Air Force Achievement Medal

  • American Bar Association, Section of Taxation, Member
  • Federal Bar Association (FBA) Section on Taxation, Member
  • FBA Section on Taxation, 2021 Tax Writing Competition Co-Chair
  • Korean American Bar Association of Washington, DC, Member
  • Woolly Mammoth Theatre Company, Volunteer Ambassador
  • Arena Stage at the Mead Center for American Theater, Volunteer Staff Member

Capabilities

Debt Finance
Government Investigations, Enforcement & Compliance
Government Program Fraud, False Claims Act & Qui Tam Litigation
International Trade
Tax
Tax Controversy & Criminal Tax
Government Contracts & Grants

Key Matters

Some of the experience represented below may have been handled at a previous firm.

Tax Controversy, Tax Planning, Mergers & Acquisitions – REPRESENTATIVE MATTERS
  • Assisted with the litigation of multi-million tax refund claim.
  • Assisted clients with complex IRS audits.
  • Assisted with litigation on the foreign earned income exclusion for the Joint Defense Facility Pine Gap (JDFPG) matter.
  • Assisted U.S. Department of Justice, Tax Division on Freedom of Information Act (FOIA) dispute regarding access to taxpayer information.
  • Defended IRS audit of US$16M stock charity donation and procured a no change letter.
  • Advised IRS LB&I on the reopening of a multinational taxpayer audit for previous tax years.
  • Advised IRS LB&I on privileges for transfer pricing valuation documents.
  • Advised on SALT tax implications for multimillion-dollar M&A deals.
  • Advised on SALT tax implications on the sale of renewable energy tax credits.
Corporate Finance, Fund Finance, Real Estate, Crypto – Representative Matters
  • Assisted clients on subscription-secured credit facilities.
  • Closed 20+ cross-border finance transactions and fund finance deals ranging from US$50M–US$1.5B.
  • Assisted financial institutions and corporate clients in connection with the negotiation and documentation of commercial, asset-based, project-related, and real estate loan transactions, as well as advising clients on legal issues arising in complex single and multi-lender loan restructures.
  • Assisted foreign and domestic institutional lenders in various forms of secured and unsecured finance transactions including subscription finance, syndicated lending, corporate finance, and leveraged finance.
  • Advised a Fortune 500 company finance division on commercial debt collection procedures and licensing requirements.
  • Represented client on non-fungible token (NFT) opinion letter addressing securities classification and regulatory requirements to operate an online NFT marketplace.
  • Assisted digital currency platform with Office of the Comptroller of the Currency (OCC) regulatory requirements and licensing procedures to establish a national bank.
  • Represented major financial institutions and hotel franchises on receivership proceedings.
FALSE CLAIMS ACT, GOVERNMENT CONTRACTS, GOVERNMENT INVESTIGATIONS – rEPRESENTATIVE MATTERS 
  • Represented the U.S. Department of the Navy (DON) on 41 suspension and debarment proceedings under FAR § 9.4.
  • Represented the DON on parallel government economic crimes investigations.
  • Assisted with government False Claims Act (FCA) investigations for DoD contracts including cross border investigations with federal law enforcement agencies, Offices of the United States Attorneys, and Fraud Section of the Department of Justice Civil Division.
  • Assisted DoD contractor with FCA investigation alleging Procurement Integrity Act (PIA) violations and bid rigging allegations.
  • Advised the DC District Court and served as a U.S. Department of Justice advisor to then Chief Judge Royce Lamberth, Senior Judge Kollar-Kotelly, and Judge Henry Kennedy on matters involving the Classified Information Procedures Act (CIPA), DOJ credentialed official with a Top Secret/Sensitive Compartmented Information (TS/SCI) clearance.
  • Represented the U.S. Food and Drug Administration (FDA) National Headquarters and the FDA Office of Regulatory Affairs (ORA) on pharmaceutical and Center for Food Safety and Applied Nutrition (CFSAN) field inspections, FDA Credentialed Official.
  • Assisted with litigation and trial preparation regarding kickback allegations on a U.S. Department of Labor Employee Benefit Plan matter.
INTERNATIONAL TRADE, SANCTIONS, 301 TARIFFS, CUSTOMS, International Trade Administration, and International Trade Commission – REPRESENTATIVE MATTERS
  • Assisted with representation in a variety of trade remedy cases, including antidumping and countervailing duty proceedings before the U.S. Department of Commerce, International Trade Administration, and International Trade Commission.
  • Advised clients on import, export, and sanctions laws, including country of origin and substantial transformation compliance questions.
  • Assisted clients on custom issues including tariff classification disputes.
  • Submitted Section 301 Tariff Exclusions on behalf of domestic businesses impacted by the 301 duties.
Additional Areas – Representative Matters
  • Assisted with litigation and obtained a settlement for a DC source of income discrimination matter.
  • Advised on distribution of Personal Protective Equipment under an emergency use authorization (EUA) during the COVID-19 public health emergency (PHE) declared under section 319 of the Public Health Service (PHS) Act.
  • Advised the U.S. Marshals Service on Federal Tort Claims Act (FTCA) damage claims against the government.

Credentials

Education

John earned his J.D., with honors, from The George Washington University Law School in 2019, where he was an associate member of The George Washington Business & Finance Law Review. He is currently pursuing his L.L.M. in taxation from the Georgetown University Law Center. He received his M.A. in human relations from the University of Oklahoma, and B.S. in business administration from the University of Phoenix.

    Admissions
    • District of Columbia

    Related Insights & News

    • “Will the Administration’s New Federal Contracting Executive Orders Result in More Efficient Procurement?,” W&S Investigations, Enforcement, & Compliance Alerts, Co-author, April 18, 2025
    • U.S. Department of the Navy (DON) Office of Small Business Programs Lunch & Learn: DON Acquisition Integrity Office, Presenter, May 9, 2023
    Blog
    Tax Controversy and Litigation Series – Look to Cases from 2024

    April 21, 2025

    Blog
    Will the Administration’s New Federal Contracting Executive Orders Result in More Efficient Procurement?

    April 18, 2025

    Blog
    Micro-Captive Reportable Transactions Regulations Finalized; Challenged

    February 4, 2025

    Blog
    Prospective Tariffs on Goods from Mexico, Canada, and China

    December 10, 2024

    View All Insights & News

    Capabilities

    Debt Finance
    Government Investigations, Enforcement & Compliance
    Government Program Fraud, False Claims Act & Qui Tam Litigation
    International Trade
    Tax
    Tax Controversy & Criminal Tax
    Government Contracts & Grants
    Logo
    facebookinstagramlinkedintwitteryoutube

    Copyright © 2025. Winston & Strawn LLP

    AlumniCorporate Transparency Act Task ForceDEI Compliance Task ForceEqual Rights AmendmentLaw GlossaryThe Oval UpdateWinston MinutePrivacy PolicyCookie PolicyFraud & Scam AlertsNoticesSubscribeAttorney Advertising