Important Updates
Important Updates
February 10, 2026 | Italy, United KingdomCNN: These Americans Are Clinging to Hope for Italian Citizenship
February 12, 2026 | MaltaMalta: Pre-Departure Course Required for New Single Permit Applicants
February 12, 2026 | South AfricaSouth Africa: Electronic Travel Authorization Requirement Updates
February 12, 2026 | 🌐Worldwide: Ramadan Will Bring Immigration Processing Delays
February 11, 2026 | United StatesUnited States: February 2026 DOL PERM and PWD Processing Times
February 10, 2026 | Italy, United KingdomCNN: These Americans Are Clinging to Hope for Italian Citizenship
February 12, 2026 | MaltaMalta: Pre-Departure Course Required for New Single Permit Applicants
February 12, 2026 | South AfricaSouth Africa: Electronic Travel Authorization Requirement Updates
February 12, 2026 | 🌐Worldwide: Ramadan Will Bring Immigration Processing Delays
February 11, 2026 | United StatesUnited States: February 2026 DOL PERM and PWD Processing Times
February 10, 2026 | Italy, United KingdomCNN: These Americans Are Clinging to Hope for Italian Citizenship
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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, “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

Games Industry: Tightening Immigration Rules Will Impact the Games Industry in 2026Read more

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
More related insights

William’s insights

February 9, 2026 | Media mentions

Games Industry: Tightening Immigration Rules Will Impact the Games Industry in 2026Read more

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
More related insights

William’s insights

February 9, 2026 | Media mentions

Games Industry: Tightening Immigration Rules Will Impact the Games Industry in 2026Read more

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
More related insights

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

February 9, 2026 | Media mentions

Games Industry: Tightening Immigration Rules Will Impact the Games Industry in 2026Read more

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
More related insights

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

February 9, 2026 | Media mentions

Games Industry: Tightening Immigration Rules Will Impact the Games Industry in 2026Read more

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
More related insights

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

February 9, 2026 | Media mentions

Games Industry: Tightening Immigration Rules Will Impact the Games Industry in 2026Read more

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
More related insights

Share

  • Twitter
  • Facebook
  • LinkedIn

Share

  • Twitter
  • Facebook
  • LinkedIn

Explore more at Fragomen

Video

Global Entry | #MobilityMinute

Director David Iannella discusses how Global Entry can help frequent business travelers navigate US entry more predictably and access TSA PreCheck.

Learn more

Immigration analysis

Applying for Swiss Citizenship: When Timing and Eligibility Matter

Manager Konstantin Schmid provides a practical overview of Swiss citizenship routes, eligibility rules and common reasons applications are delayed or refused. 

Learn more

Media mentions

CNN: These Americans Are Clinging to Hope for Italian Citizenship

Manager Pierangelo D’Errico discusses how recent changes to Italy’s citizenship rules are affecting applicants with Italian ancestry.

Learn more

Podcast

Space for Everyone: Women in Space - Breaking Barriers, Shaping the Future

Director Laxmi Limbani discusses how women are shaping the global space sector, the barriers they face and what is needed to support a more inclusive space workforce.

Learn more

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Games Industry: Tightening Immigration Rules Will Impact the Games Industry in 2026

Senior Manager William Diaz outlines how immigration changes in the US and UK may affect workforce planning and mobility for the games industry in 2026.

Learn more

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Global Mobility Lawyer: Talent Fault Line: How Modern Risks Are Reshaping Global Mobility

Partner Julia Onslow-Cole highlights how global mobility is becoming a strategic, board-level consideration requiring careful planning, compliance and workforce management.

Learn more

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Ireland Employment Permit Salaries: Hiring and Renewal Risks for Employers

Director Fatima Aydin outlines Ireland’s roadmap for increasing minimum annual remuneration salary thresholds and the implications for employer workforce planning and compliance.

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Samba, Stamps and Seleção: Moving Football Across South America | #FragomenFC - Ep. 14

In this episode of the Fragomen FC, Partner Rick Lamanna, Senior Manager Jake Paul Minster, Manager Gustavo Kanashiro and Manager Sergio Flores discuss how immigration systems across the Americas shape football mobility, compliance and cross-border movement throughout South America.

Learn more

Blog post

§ 45c AufenthG: Neue Informationspflicht für Arbeitgeber bei Anwerbung aus dem Ausland

Senior Associate Ruben Fiedler outlines the new employer information obligation under Section 45c of the German Residence Act, explaining when it applies, what employers must provide to third-country nationals recruited from abroad and the practical steps needed to ensure compliance from 1 January 2026.

Learn more

Podcast

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Partners Cosmina Morariu and Rahul Soni examine how immigration and global mobility trends are influencing workforce strategy across the luxury sector.

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Migration After Brexit: What the UK Can Learn from the EU’s Talent Strategy

UK Government Affairs Strategy Director Shuyeb Muquit compares the EU’s new Visa Strategy with the UK’s post-Brexit immigration system and assesses what the UK can learn to remain competitive for global talent.

Learn more

Media mentions

Gazeta Prawna: Dodatkowa przeszkoda w delegowaniu pracowników

Partner Karolina Schiffter highlights that new electronic signature rules may delay work permit procedures for foreign workers in Poland.

Learn more

Video

Global Entry | #MobilityMinute

Director David Iannella discusses how Global Entry can help frequent business travelers navigate US entry more predictably and access TSA PreCheck.

Learn more

Immigration analysis

Applying for Swiss Citizenship: When Timing and Eligibility Matter

Manager Konstantin Schmid provides a practical overview of Swiss citizenship routes, eligibility rules and common reasons applications are delayed or refused. 

Learn more

Media mentions

CNN: These Americans Are Clinging to Hope for Italian Citizenship

Manager Pierangelo D’Errico discusses how recent changes to Italy’s citizenship rules are affecting applicants with Italian ancestry.

Learn more

Podcast

Space for Everyone: Women in Space - Breaking Barriers, Shaping the Future

Director Laxmi Limbani discusses how women are shaping the global space sector, the barriers they face and what is needed to support a more inclusive space workforce.

Learn more

Media mentions

Games Industry: Tightening Immigration Rules Will Impact the Games Industry in 2026

Senior Manager William Diaz outlines how immigration changes in the US and UK may affect workforce planning and mobility for the games industry in 2026.

Learn more

Media mentions

Global Mobility Lawyer: Talent Fault Line: How Modern Risks Are Reshaping Global Mobility

Partner Julia Onslow-Cole highlights how global mobility is becoming a strategic, board-level consideration requiring careful planning, compliance and workforce management.

Learn more

Video

Ireland Employment Permit Salaries: Hiring and Renewal Risks for Employers

Director Fatima Aydin outlines Ireland’s roadmap for increasing minimum annual remuneration salary thresholds and the implications for employer workforce planning and compliance.

Learn more

Video

Samba, Stamps and Seleção: Moving Football Across South America | #FragomenFC - Ep. 14

In this episode of the Fragomen FC, Partner Rick Lamanna, Senior Manager Jake Paul Minster, Manager Gustavo Kanashiro and Manager Sergio Flores discuss how immigration systems across the Americas shape football mobility, compliance and cross-border movement throughout South America.

Learn more

Blog post

§ 45c AufenthG: Neue Informationspflicht für Arbeitgeber bei Anwerbung aus dem Ausland

Senior Associate Ruben Fiedler outlines the new employer information obligation under Section 45c of the German Residence Act, explaining when it applies, what employers must provide to third-country nationals recruited from abroad and the practical steps needed to ensure compliance from 1 January 2026.

Learn more

Podcast

Luxury Unwrapped

Partners Cosmina Morariu and Rahul Soni examine how immigration and global mobility trends are influencing workforce strategy across the luxury sector.

Learn more

Blog post

Migration After Brexit: What the UK Can Learn from the EU’s Talent Strategy

UK Government Affairs Strategy Director Shuyeb Muquit compares the EU’s new Visa Strategy with the UK’s post-Brexit immigration system and assesses what the UK can learn to remain competitive for global talent.

Learn more

Media mentions

Gazeta Prawna: Dodatkowa przeszkoda w delegowaniu pracowników

Partner Karolina Schiffter highlights that new electronic signature rules may delay work permit procedures for foreign workers in Poland.

Learn more

Stay in touch

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