Senior Manager
William Diaz
Country / Territory
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Languages
- English
Contact information
William is a Senior Manager based in Fragomen’s London office. He assists clients in a variety of industries including finance, technology and entertainment, with a particular emphasis on assisting with complex consular filing for treaty investors, intracompany transferees and individuals of extraordinary ability.
William frequently advises small and medium-sized enterprises throughout the EMEA region in expanding to the U.S. and transferring key personnel. These clients range from start-ups to long established businesses across a range of professions.
He has previously volunteered with various organisations, including a civil liberties non-profit and an international criminal tribunal.
Education
- Leiden University, LL.M., 2011
- Pace University School of Law, J.D., 2009
- Fordham University, B.A., 2005
More from William
Admissions
Immigration Credentials: Registered Attorney with the United States Department of Justice’s Executive Office for Immigration Review, 2013-present
Bar Admissions: New York State
Professional accomplishments
Member, American Immigration Lawyers Association (AILA)
Former Member, AILA CBP Liaison Committee
Experience
Obtained a nonimmigrant waiver of inadmissibility for a noted entertainer with previous criminal convictions.
Advised a multinational vehicle manufacturer in transferring key managerial and technical personnel for the expansion of their U.S. operations.
Helped a search engine provider with a complex business ownership structure acquire E-2 company registration and transfer key managers and executives to the United States.
Devised strategies to ensure a television production company could transfer key talent on an expedited basis during a period of prolonged global disruption in U.S. visa issuance.
Advised a start-up technology marketing firm and guided U.S. expansion strategy to support treaty investor visas for key managerial and specialist personnel.
Publications and lectures
Author, “Tightening immigration rules will impact the games industry in 2026.” Games Industry, 6 February 2026.
Author, “Games Industry: US H-1B Visas: Alternatives to a $100,000 Fee.” Fragomen, 29 October 2025.
Author, “Tech and Global Mobility: The impact of the new US Administration.” Computer Weekly, 4 March 2025.
Panelist, “Bobbing for Visas: Alternative Uses for the B Visa Category.” AILA Rome District Chapter Fall Conference 2023, London, UK, October 2023.
Presenter, “US Growth Programme: Visas for investment and expansion.” TechNation US Growth Workshop 3.0, London, UK, September 2022.
Panelist, “Ch-Ch-Changes: Regulatory, Policy, and Adjudications.” AILA National Conference 2020, Webinar, July 2020.
Presenter, “US Visas for Irish Investors.” Dublin Chamber of Commerce, Dublin, Ireland, February 2020.
Presenter, “Obtaining the Right Visas.” UK Department of International Trade, Cambridge, UK, October 2019.
Presenter, “Visa for US expansion.” Fingal Dublin Chamber, Dublin, Ireland, February 2019.
Presenter, “US Immigration for Investors.” South West World Trade Summit, Bristol, UK, July 2018.
Presenter, “US Immigration for Latvian Investors.” Gateway to the USA Program, Riga, Latvia, May 2018.
Panelist, “Humanitarian Options of Last Resort.” AILA National Conference 2017, New Orleans, Louisiana, June 2017.
Co-author, “Humanitarian Options of Last Resort.” AILA Immigration Practice Pointers (2017-18 Ed.), Pages 575-585, 2017.
Panelist, “Advanced E Visas.” AILA Rome District Chapter Fall Conference 2016, Amsterdam, Netherlands, October 2016.
Author, “Common US immigration consequences of mergers and acquisitions.” Human Resource Management International Digest, Volume 23, Issue 7 (2015). Print and web.
Author, “Want to work in the US? The secret to securing a successful application.” The Stage, September 25, 2015. Web.
Author, “Global Mobility Strategies for SMEs Expanding to the US.” Corporate Vision Magazine, August 2015: 42-43. Print and web.
Author, “From Posting to Permanent Residency.” Global: The International Briefing, December 2015: 40-41. Print and web.
Author, “Transferring Professional Athletes to the U.S.” HRreview, July 10, 2015. Web.
Author, “US visa eligibility: five HR issues when transferring employees.” Personnel Today, August 28, 2015. Web.
Panelist, "Legal IT Roundtable." Roundtable event, The Law Society Gazette, London, UK, July 2015.
Presenter, “US immigration for start-ups.” Presentation, Access to the US and the US Ignite Program, London, UK, June 2015.
Contributor, “Clarkson faced police interview over attack.” The Times, 27 March 2015.
Presenter, “US immigration overview.” Presentation, Techstars, London, UK, January 2015.
Author, “Dualist, but not Divergent: Evaluating United States Implementation of the 1267 Sanctions Regime.” Liberty University Law Review, Volume 5, Issue 3 (2011): 333-378. Print and web.
William’s insights
February 9, 2026 | Media mentions
October 29, 2025 | Media mentions
