Important Updates
Important Updates
November 7, 2025 | 🌐Minimum Salary Changes Announced
November 7, 2025 | Canada Canada: New Measures Prioritize Graduate and Doctoral Student Recruitment
November 7, 2025 | CanadaCanada: Ontario Implements Key Reforms to the Immigrant Nominee Program
November 7, 2025 | CanadaCanada: Quebec’s 2026–2029 Immigration Plan Announced, with Key Program Measures and Updates
November 7, 2025 | Mexico, PeruMexico/Peru: Suspension of Diplomatic Ties May Affect Immigration Processing
November 7, 2025 | 🌐Minimum Salary Changes Announced
November 7, 2025 | Canada Canada: New Measures Prioritize Graduate and Doctoral Student Recruitment
November 7, 2025 | CanadaCanada: Ontario Implements Key Reforms to the Immigrant Nominee Program
November 7, 2025 | CanadaCanada: Quebec’s 2026–2029 Immigration Plan Announced, with Key Program Measures and Updates
November 7, 2025 | Mexico, PeruMexico/Peru: Suspension of Diplomatic Ties May Affect Immigration Processing
November 7, 2025 | 🌐Minimum Salary Changes Announced
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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

October 29, 2025 | Media mentions

Games Industry: US H-1B Visas: Alternatives to a $100,000 FeeRead more

October 7, 2025 | Webinar

Fragomen and Interstride Webinar Series: Immigration Options for Business Students, Investors & EntrepreneursRead more

March 5, 2025 | Media mentions

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

William’s insights

October 29, 2025 | Media mentions

Games Industry: US H-1B Visas: Alternatives to a $100,000 FeeRead more

October 7, 2025 | Webinar

Fragomen and Interstride Webinar Series: Immigration Options for Business Students, Investors & EntrepreneursRead more

March 5, 2025 | Media mentions

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

William’s insights

October 29, 2025 | Media mentions

Games Industry: US H-1B Visas: Alternatives to a $100,000 FeeRead more

October 7, 2025 | Webinar

Fragomen and Interstride Webinar Series: Immigration Options for Business Students, Investors & EntrepreneursRead more

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

October 29, 2025 | Media mentions

Games Industry: US H-1B Visas: Alternatives to a $100,000 FeeRead more

October 7, 2025 | Webinar

Fragomen and Interstride Webinar Series: Immigration Options for Business Students, Investors & EntrepreneursRead more

March 5, 2025 | Media mentions

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

Share

  • Twitter
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  • 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

October 29, 2025 | Media mentions

Games Industry: US H-1B Visas: Alternatives to a $100,000 FeeRead more

October 7, 2025 | Webinar

Fragomen and Interstride Webinar Series: Immigration Options for Business Students, Investors & EntrepreneursRead more

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

October 29, 2025 | Media mentions

Games Industry: US H-1B Visas: Alternatives to a $100,000 FeeRead more

October 7, 2025 | Webinar

Fragomen and Interstride Webinar Series: Immigration Options for Business Students, Investors & EntrepreneursRead more

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

Awards

Fragomen Ranked in 2026 Edition of "Best Law Firms in the United States" by The Best Lawyers

Fragomen is recognized at the National Tier 1 level for Immigration Law in the 2026 edition of The Best Law Firms – United States, with 15 offices across the country also recognized for their excellence in immigration law.

Learn more

Awards

Fragomen Wins Altair Global’s 2025 Super Star Award for Humanitarian Commitment

Fragomen receives Altair Global’s 2025 Super Star Award for Humanitarian Commitment, honoring the firm’s leadership in advancing humanitarian mobility initiatives.

Learn more

Media mentions

The Toronto Star: Canada will reduce international student permits by more than half, budget reveals

Partner Rick Lamanna discusses Canada’s 2025 federal budget and its significant shift in immigration policy including new limits on international student permits and temporary residents.

Learn more

Fragomen news

2025年10月 アメリカ移民法ダイジェスト Learn more

Fragomen news

Fragomen Cited in House of Lords Report on the Future of the UK Space Economy

Fragomen is cited in the UK House of Lords’ landmark report, “The Space Economy: Act Now or Lose Out,” published on 4 November by the UK Engagement with Space Committee.

Learn more

Blog post

Georgia Immigration Reform 2025: New Work Permit Rules for Foreign Nationals

Manager Zaur Gasimov discusses Georgia’s new immigration and labour-migration reforms introducing mandatory work permits, stricter employer compliance requirements and increased penalties for non-compliance.

Learn more

Awards

Senior Associate Agata Richardson Honored with Casa Cornelia Law Center Pro Bono Publico Award

Senior Associate Agata Danuta Richardson is recognized with a prestigious Pro Bono Publico Award by the Casa Cornelia Law Center.

Learn more

Media mentions

European Security & Technology Magazine: Die kritische Wachstumsbremse der europäischen Verteidigungsindustrie

Frankfurt Managing Partner Dr. Axel Boysen highlights the growing skilled labor gap as Europe’s defense industry expands.

Learn more

Media mentions

Games Industry: US H-1B Visas: Alternatives to a $100,000 Fee

Senior Manager William Diaz outlines the US visa options available to the games industry for bringing international talent to the United States, including O-1, L-1 and E-2.

Learn more

Media mentions

People Management: How Will EU Travel Rule Changes Impact Employers?

Partner Jo Antoons and Manager Andreia Ghimis explain how businesses can navigate Europe’s new ETIAS pre-travel authorisation and avoid disruptions.

Learn more

Media mentions

Arts Professional: How Easy Is It for Overseas Creatives to Work in the UK?

Partner Louise Haycock and Associate Jennifer Gray analyse the barriers and opportunities for overseas creatives navigating the UK’s immigration system.

Learn more

Blog post

Claiming British Citizenship Through Ancestral Lineage: Who Is Eligible?

Associate Chloe Evans outlines eligibility criteria for individuals seeking British citizenship based on ancestral ties.

Learn more

Awards

Fragomen Ranked in 2026 Edition of "Best Law Firms in the United States" by The Best Lawyers

Fragomen is recognized at the National Tier 1 level for Immigration Law in the 2026 edition of The Best Law Firms – United States, with 15 offices across the country also recognized for their excellence in immigration law.

Learn more

Awards

Fragomen Wins Altair Global’s 2025 Super Star Award for Humanitarian Commitment

Fragomen receives Altair Global’s 2025 Super Star Award for Humanitarian Commitment, honoring the firm’s leadership in advancing humanitarian mobility initiatives.

Learn more

Media mentions

The Toronto Star: Canada will reduce international student permits by more than half, budget reveals

Partner Rick Lamanna discusses Canada’s 2025 federal budget and its significant shift in immigration policy including new limits on international student permits and temporary residents.

Learn more

Fragomen news

2025年10月 アメリカ移民法ダイジェスト Learn more

Fragomen news

Fragomen Cited in House of Lords Report on the Future of the UK Space Economy

Fragomen is cited in the UK House of Lords’ landmark report, “The Space Economy: Act Now or Lose Out,” published on 4 November by the UK Engagement with Space Committee.

Learn more

Blog post

Georgia Immigration Reform 2025: New Work Permit Rules for Foreign Nationals

Manager Zaur Gasimov discusses Georgia’s new immigration and labour-migration reforms introducing mandatory work permits, stricter employer compliance requirements and increased penalties for non-compliance.

Learn more

Awards

Senior Associate Agata Richardson Honored with Casa Cornelia Law Center Pro Bono Publico Award

Senior Associate Agata Danuta Richardson is recognized with a prestigious Pro Bono Publico Award by the Casa Cornelia Law Center.

Learn more

Media mentions

European Security & Technology Magazine: Die kritische Wachstumsbremse der europäischen Verteidigungsindustrie

Frankfurt Managing Partner Dr. Axel Boysen highlights the growing skilled labor gap as Europe’s defense industry expands.

Learn more

Media mentions

Games Industry: US H-1B Visas: Alternatives to a $100,000 Fee

Senior Manager William Diaz outlines the US visa options available to the games industry for bringing international talent to the United States, including O-1, L-1 and E-2.

Learn more

Media mentions

People Management: How Will EU Travel Rule Changes Impact Employers?

Partner Jo Antoons and Manager Andreia Ghimis explain how businesses can navigate Europe’s new ETIAS pre-travel authorisation and avoid disruptions.

Learn more

Media mentions

Arts Professional: How Easy Is It for Overseas Creatives to Work in the UK?

Partner Louise Haycock and Associate Jennifer Gray analyse the barriers and opportunities for overseas creatives navigating the UK’s immigration system.

Learn more

Blog post

Claiming British Citizenship Through Ancestral Lineage: Who Is Eligible?

Associate Chloe Evans outlines eligibility criteria for individuals seeking British citizenship based on ancestral ties.

Learn more

Stay in touch

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