Mr. Oosterhuis has extensive experience in mergers and acquisitions, post-acquisition integration, spin-offs, internal restructurings and joint ventures. He also represents multinational companies in nontransactional international tax planning and assists clients in resolving high-stakes, complex tax controversies. Mr. Oosterhuis has been ranked in the top tier of Chambers USA each year since the guide was first released in 2003. He also has been ranked in the top tier of Chambers Global each year since 2002. In addition, he repeatedly has been selected for inclusion in Tax Directors Handbook, The Legal 500 U.S., Who’s Who Legal: Corporate Tax, IFLR1000 and The Best Lawyers in America. He also was named as a 2017 BTI Client Service All-Star. For the past several years, Ms. Oosterhuis has been actively involved in U.S. and international tax policy matters. In addition to writing and speaking on various topics, he has testified before Congress on U.S. tax reform and base erosion and profit shifting, or BEPS, issues. He also represented clients in working with congressional staff to develop various international provisions of the 2017 Tax Cuts and Jobs Act, and with Treasury and IRS staff in developing regulations implementing those provisions. In addition, he is an active participant in the ongoing OECD efforts related to the tax challenges arising from the digitalization of the economy.