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July 23, 2025 | United KingdomConstruction Management: Immigration Reforms: What’s Next for Construction Employers?
July 24, 2025 | China, AzerbaijanAzerbaijan/Mainland China: Reciprocal Visa Exemption in Effect
July 24, 2025 | United StatesThe PIE: More Declines Loom in “Seriously Concerning” US Visa Trends
July 24, 2025 | United Kingdom, IndiaUnited Kingdom/India: Free Trade Agreement and Social Security Agreement Forthcoming
July 24, 2025 | United StatesUnited States: Ninth Circuit Affirms Nationwide Scope of Birthright Citizenship Injunction
July 23, 2025 | United KingdomConstruction Management: Immigration Reforms: What’s Next for Construction Employers?
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William Diaz

Senior Manager

William Diaz

William Diaz
William Diaz
  • People

Senior Manager

William Diaz

Country / Territory

  • United KingdomUnited Kingdom

Get in touch

Languages

  • English

Contact information

Email

[email protected]

T:+44 (0)207 090 9272

F:+44 (0)207 090 9101

London

Fragomen LLP

1st Floor, 95 Gresham St,

London EC2V 7NA

United Kingdom

Connect via Linkedin

Get in touch

Languages

  • English

Contact information

Email

[email protected]

T:+44 (0)207 090 9272

F:+44 (0)207 090 9101

London

Fragomen LLP

1st Floor, 95 Gresham St,

London EC2V 7NA

United Kingdom

Connect via Linkedin

Get in touch

Languages

  • English

Contact information

Email

[email protected]

T:+44 (0)207 090 9272

F:+44 (0)207 090 9101

London

Fragomen LLP

1st Floor, 95 Gresham St,

London EC2V 7NA

United Kingdom

Connect via Linkedin
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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, “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

March 5, 2025 | Media mentions

Computer Weekly: Tech and Global Mobility: The Impact of the New US AdministrationRead more

William’s insights

March 5, 2025 | Media mentions

Computer Weekly: Tech and Global Mobility: The Impact of the New US AdministrationRead more

William’s insights

March 5, 2025 | Media mentions

Computer Weekly: Tech and Global Mobility: The Impact of the New US AdministrationRead more

Country / Territory

  • United KingdomUnited Kingdom

Get in touch

Languages

  • English

Contact information

Email

[email protected]

T:+44 (0)207 090 9272

F:+44 (0)207 090 9101

London

Fragomen LLP

1st Floor, 95 Gresham St,

London EC2V 7NA

United Kingdom

Connect via Linkedin

William’s insights

March 5, 2025 | Media mentions

Computer Weekly: Tech and Global Mobility: The Impact of the New US AdministrationRead more

Share

  • Twitter
  • Facebook
  • LinkedIn

Share

  • Twitter
  • Facebook
  • LinkedIn

Get in touch

Languages

  • English

Contact information

Email

[email protected]

T:+44 (0)207 090 9272

F:+44 (0)207 090 9101

London

Fragomen LLP

1st Floor, 95 Gresham St,

London EC2V 7NA

United Kingdom

Connect via Linkedin

William’s insights

March 5, 2025 | Media mentions

Computer Weekly: Tech and Global Mobility: The Impact of the New US AdministrationRead more

Share

  • Twitter
  • Facebook
  • LinkedIn

Share

  • Twitter
  • Facebook
  • LinkedIn

Get in touch

Languages

  • English

Contact information

Email

[email protected]

T:+44 (0)207 090 9272

F:+44 (0)207 090 9101

London

Fragomen LLP

1st Floor, 95 Gresham St,

London EC2V 7NA

United Kingdom

Connect via Linkedin

William’s insights

March 5, 2025 | Media mentions

Computer Weekly: Tech and Global Mobility: The Impact of the New US AdministrationRead more

Share

  • Twitter
  • Facebook
  • LinkedIn

Share

  • Twitter
  • Facebook
  • LinkedIn

Explore more at Fragomen

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The PIE: More Declines Loom in “Seriously Concerning” US Visa Trends

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Learn more

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Associate Ilaria Iovieno outlines how recent UK immigration reforms will impact construction employers and their ability to sponsor overseas talent.

Learn more

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Grand Designs Magazine: How to Buy Your Dream Home Overseas

Director Isobel Neilson discusses how changes to golden visa programmes are affecting UK buyers pursuing overseas property investment.

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TechInformed: Global Talent, Local Growth: Immigration’s Role in the Tech Economy

Senior Associate Tayyaba Karim and Associates Aisha Shahid and Yinny Tan outline how UK immigration changes affect tech talent access and business alignment.

Learn more

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The New York Times: Hoping to Visit the U.S.? It Might Cost You an Extra $250.

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Learn more

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Update on U.S. Tariffs | #MobilityMinute

In this Mobility Minute, Partner Christian Dallman shares an update on US tariffs as the August 1 deadline for trade negotiations approaches.

Learn more

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Partner Haider Hussain discussed how Saudi Arabia’s new skill-based work permit system is reshaping employer compliance and recruitment strategies.

Learn more

Podcast

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Director Caroline Kanzara-Obinwa and Manager Tarissa Wareley are joined by Bloomfield Law Practice's Kunle Obebe and Peace Lotechukwu to discuss Nigeria's 2025 visa policy reforms.

Learn more

Media mentions

Windpower Monthly: Wind Industry’s Chronic Skills Shortage Exacerbated by Tough Immigration Rules

Associate Yinny Tan outlines how proposed UK immigration changes may affect workforce planning and talent access in the wind industry.

Learn more

Blog post

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Senior Manager Sean Rhodes, Associate Jennifer Gray and Paralegal Mariel Arquero outlines how the United Kingdom's 2025 immigration policy changes will impact the creative industries.

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AAML: Navigating U.S. Passport Applications for Minors Under 16: A Guide for Family Law Attorneys

Senior Associate Carolyn Alvarez outlines US passport rules for minors to guide family law attorneys on immigration requirements.

Learn more

Media mentions

The PIE: More Declines Loom in “Seriously Concerning” US Visa Trends

Partner Aaron Blumberg noted that enhanced screening measures, including social media vetting, may be contributing to delays in US student visa processing.

Learn more

Media mentions

Construction Management: Immigration Reforms: What’s Next for Construction Employers?

Associate Ilaria Iovieno outlines how recent UK immigration reforms will impact construction employers and their ability to sponsor overseas talent.

Learn more

Media mentions

Grand Designs Magazine: How to Buy Your Dream Home Overseas

Director Isobel Neilson discusses how changes to golden visa programmes are affecting UK buyers pursuing overseas property investment.

Learn more

Media mentions

TechInformed: Global Talent, Local Growth: Immigration’s Role in the Tech Economy

Senior Associate Tayyaba Karim and Associates Aisha Shahid and Yinny Tan outline how UK immigration changes affect tech talent access and business alignment.

Learn more

Media mentions

The New York Times: Hoping to Visit the U.S.? It Might Cost You an Extra $250.

Partner Parisa Karaahmet is quoted on a new country-specific, $250 "visa integrity fee" introduced by the current US administration as part of a domestic policy bill.

Learn more

Media mentions

New Civil Engineer: The immigration white paper and the government’s Industrial Strategy – how do they compare?

Paralegal Sean Pearce discusses the UK government's immigration White Paper in the context of its Industrial Strategy, noting the importance of overseas talent in meeting infrastructure and housing goals.

Learn more

Video

Update on U.S. Tariffs | #MobilityMinute

In this Mobility Minute, Partner Christian Dallman shares an update on US tariffs as the August 1 deadline for trade negotiations approaches.

Learn more

Media mentions

Saudi Gazette: Saudi Arabia’s Skill-Based Work Permit System Reshapes Expat Employment Landscape

Partner Haider Hussain discussed how Saudi Arabia’s new skill-based work permit system is reshaping employer compliance and recruitment strategies.

Learn more

Podcast

Visa Policy Changes in Nigeria

Director Caroline Kanzara-Obinwa and Manager Tarissa Wareley are joined by Bloomfield Law Practice's Kunle Obebe and Peace Lotechukwu to discuss Nigeria's 2025 visa policy reforms.

Learn more

Media mentions

Windpower Monthly: Wind Industry’s Chronic Skills Shortage Exacerbated by Tough Immigration Rules

Associate Yinny Tan outlines how proposed UK immigration changes may affect workforce planning and talent access in the wind industry.

Learn more

Blog post

UK Creative Industries & Immigration: What the 2025 Policy Changes Mean

Senior Manager Sean Rhodes, Associate Jennifer Gray and Paralegal Mariel Arquero outlines how the United Kingdom's 2025 immigration policy changes will impact the creative industries.

Learn more

Media mentions

AAML: Navigating U.S. Passport Applications for Minors Under 16: A Guide for Family Law Attorneys

Senior Associate Carolyn Alvarez outlines US passport rules for minors to guide family law attorneys on immigration requirements.

Learn more

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