Diana Doyle primarily advises on tax planning for multinational companies with an emphasis on private and public company mergers and acquisitions. Ms. Doyle has advised domestic and international companies on such matters as structuring taxable and tax-free stock and asset acquisitions and dispositions, cross-border migrations, tax-free reorganizations and spin-offs, securities offerings, limited liability company agreements, and partnership tax. Ms. Doyle also has significant experience with tax audits, administrative appeals, and litigation.

Ms. Doyle is a member of and former Chair of the planning committee for the University of Chicago Tax Conference. She is a frequent speaker and writer on a variety of tax topics, including the following presentations and publications:

  • “Cross-Border M&A Planning and Development” at Practising Law Institute’s International Tax Issues (2021)
  • Investment Banking: Valuation, LBOs, M&A, and IPOs – Third Edition (2020) (Contributor)
  • “TCJA & CARES Act Interactions – Traps for the Unwary” at Tax Executives Institutes’ 75th Annual Conference (2020)
  • “The Graphic Guide to Section 163(j)” published in March/April edition of Tax Executive Magazine (2019)
  • “Back in Time: In Search of a Coherent Theory of Transactional Retroactivity” at the University of Chicago Federal Tax Conference (2016) (paper published in March 2017 edition of TAXES)

Chambers USA consistently ranks Ms. Doyle for her efforts in the tax practice and she was recognized by The Legal 500 for her work in the US Taxes: Non-Contentious practice. She chairs Latham & Watkins' Brexit Task Force and is a member of its global strategic Initiatives Committee. Ms. Doyle is recognized for her work in Tax Law by Best Lawyers in America and has been named Chicago Tax Law Lawyer of the Year in the 2018, 2019, and 2023 editions. Ms. Doyle also has a particular interest in issues concerning women in the law and is a past board member of the Chicago-based Coalition of Women’s Initiatives in Law and a past Advisory Board member of Latham’s Women Enriching Business (WEB) initiative. Ms. Doyle is also former Chair of Latham's Chicago Tax Department.

Ms. Doyle’s recent representative matters include advising:

  • Libbey Glass in connection with its Chapter 11 proceedings
  • Hyatt Hotels Corporation in various transactions, including:
    • Term loan facility, concurrent with a US$900 million bond offering
    • Sale of the owner of the Grand Hyatt Seoul to an international consortium
    • Acquisition of Two Roads Hospitality, an international lifestyle hotel company
  • Loews Hotels in its numerous development projects, including joint venture projects in Arlington, TX, Kansas City and St. Louis
  • Illinois Tool Works Inc. in numerous acquisitions, including:
    • Acquisition of MTS Systems Corporation, a supplier of advanced test systems, motion simulators, and precision sensors
    • Acquisition of the Engineered Fasteners and Components business (EF&C) of ZF TRW, an automotive OEM and components supplier
  • ZF Friedrichshafen in its acquisition of WABCO Holdings, a provider of electronic, mechanical, electro-mechanical, and aerodynamic products
  • Ardian in its acquisition of a 100% equity stake in Les Dérivés Résiniques et Terpéniques (DRT), a France-based developer of gum rosin and turpentine that are extracted from pine resins
  • Körber AG in its acquisition of HighJump Software, a US-based supply chain and cloud solutions specialist
  • Henkel Corporation in its acquisition of Darex Packaging Technologies, a supplier of can coatings and closure sealants for the food and beverage packaging industry
  • Illinois Tool Works Inc. in its acquisition of the Engineered Fasteners and Components business (EF&C) of ZF TRW, an automotive OEM and components supplier
  • Sale by Baxter International of the rights to two certain generic injectable products to Renaissance Lakewood LLC, in connection with Baxter’s acquisition of Claris Injectables
  • HHM in its joint venture in connection with the acquisition and financing of the Atlanta DoubleTree Hotel
  • Psyop Media Company in its acquisition of a minority stake in Golden Wolf, a London-based animation studio
  • Globe Specialty Metals, Inc. in its cross-border merger with Grupo FerroAtlantica to create a leading international silicon and specialty metals producer

Thought Leadership

  • “IRS Issues Proposed Regulations on Business Interest Deduction Limitations” Latham & Watkins Client Alert (December 2018)
  • “Treasury Targets Inversions and Related-Party Debt with Far-Reaching Regulations,” Latham & Watkins Article (April 2016)
  • “Treasury Targets Related-Party Debt with Proposed Regulations to Treat Debt as Equity,” Latham & Watkins Client Alert (April 2016)
  • “Treasury Issues Stringent Inversion Regulations, Proposes Far-Reaching Related-Party Debt Rules,” Latham & Watkins Client Alert (April 2016)

Bar Qualification

  • Illinois


  • JD, University of Chicago Law School, 1996
    with honors
  • BS, Northwestern University, 1988
    with distinction