Former Department of Treasury official Robert Stack joins Deloitte

International Tax Review is part of Legal Benchmarking Limited, 1-2 Paris Garden, London, SE1 8ND

Copyright © Legal Benchmarking Limited and its affiliated companies 2025

Accessibility | Terms of Use | Privacy Policy | Modern Slavery Statement

Former Department of Treasury official Robert Stack joins Deloitte

Robert Stack

Deloitte has announced the appointment of Robert Stack as managing director of its national tax – international tax service group in Washington.



Before joining the firm, Stack served as the deputy assistant secretary for international tax affairs at the US Department of Treasury. In this role, he worked closely with the assistant secretary of tax policy and the international tax counsel to incorporate (aspects of) international tax policy within domestic law. Furthermore, he sat as the official representative of the Obama administration for international tax policy and represented the US government at the OECD, where he was heavily involved in all aspects of the BEPS initiative.  

Stack’s wealth of international tax experience along with his tax technical talent is set to significantly strengthen Deloitte’s tax practice. Stack will advise US clients and collaborate with the firm’s global network on international tax developments, including those sanctioned by the OECD.

Stack has been named in the Global Tax 50 on three separate occasions, including in its most recent iteration in 2016.



more across site & shared bottom lb ros

More from across our site

ITR spoke to two US TP experts about the long-running dispute, with one arguing that the case highlights ‘weaknesses’ with the comparable uncontrolled transaction method
The new practice, which features former ‘big four’ experience, already has over 20 team members
Speakers from companies including Uber and Stripe told the inaugural AI in Tax Forum to brace for impending changes to how advisers work
Authors from Khaitan & Co dissect a ‘welcome’ ruling, which found that the mere existence of a tax benefit would not, by itself, warrant a principal purpose test
Over two-thirds of survey respondents back the continuation of the UK’s digital services tax, research commissioned by the Fair Tax Foundation also found
Given the US/G7 pillar two deal, the OECD is in danger of being replaced by the UN as the leading global tax reform forum
Cinven’s latest investment follows its acquisition of a stake in Grant Thornton UK in December; in other news, a barrister listed by HMRC as a tax avoidance promoter has alleged harassment
CIT base narrowing measures remain more prevalent than increased CIT rates, the report also highlighted
ITR's parent company, LBG, will acquire The Lawyer, a leading news, intelligence and data-driven insight provider for the legal industry, from Centaur Media
KPMG UK’s Graeme Webster and KPMG Meijburg & Co’s Eduard Sporken outline the 20-year evolution of MAPAs, with DEMPE analyses becoming more prevalent and MAPA requirements growing stricter
Gift this article