Important Updates
Important Updates
December 23, 2025 | ZimbabweZimbabwe: New Indigenization Regulations in Effect
December 23, 2025 | United StatesFranceinfo: États-Unis : bientôt une inspection au peigne fin des réseaux sociaux avant d'entrer sur le territoire
December 23, 2025 | CanadaToronto Star: Canada Wants to Bring in 1,000 Researchers and Skilled Workers. Here’s What It Will Take
December 23, 2025 | United StatesUnited States: DHS Issues Final Rule to Replace Random H-1B Cap Lottery with Wage-Level-Based Weighted System for H-1B Cap Allocation in Time for Implementation in Early 2026
December 23, 2025 | United StatesUnited States: USCIS Suspends Approvals of Pending Diversity Visa Adjustment Applications While Security Reviews Are Conducted
December 23, 2025 | ZimbabweZimbabwe: New Indigenization Regulations in Effect
December 23, 2025 | United StatesFranceinfo: États-Unis : bientôt une inspection au peigne fin des réseaux sociaux avant d'entrer sur le territoire
December 23, 2025 | CanadaToronto Star: Canada Wants to Bring in 1,000 Researchers and Skilled Workers. Here’s What It Will Take
December 23, 2025 | United StatesUnited States: DHS Issues Final Rule to Replace Random H-1B Cap Lottery with Wage-Level-Based Weighted System for H-1B Cap Allocation in Time for Implementation in Early 2026
December 23, 2025 | United StatesUnited States: USCIS Suspends Approvals of Pending Diversity Visa Adjustment Applications While Security Reviews Are Conducted
December 23, 2025 | ZimbabweZimbabwe: New Indigenization Regulations in Effect
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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

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
  • 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

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

Media mentions

Franceinfo: États-Unis : bientôt une inspection au peigne fin des réseaux sociaux avant d'entrer sur le territoire

Partner K. Edward Raleigh commented on proposed changes to US entry requirements.

Learn more

Video

The Schengen C Visa: What Non-EU Nationals Need to Know About 90/180-Day Travel

Business Immigration Consultant Marisa Gizzi from Fragomen explains everything about the Schengen C Visa: who needs it, how to apply and key travel tips to stay compliant in the Schengen Area. 

Learn more

Media mentions

Toronto Star: Canada Wants to Bring in 1,000 Researchers and Skilled Workers. Here’s What It Will Take

Partner Rick Lamanna discussed Canada’s $1B plan to attract global researchers.

Learn more

Blog post

Tier 1 Investor Visa Extension Deadline | February 2026 UK Update

Manager Alex Hood, Senior Associate Kimberley Ong and Immigration Paralegal Ataa Rajput explain the final extension and settlement deadlines for UK Tier 1 Investor visa holders and outline who can still qualify and why early action is essential.

Learn more

Media mentions

Business Insider: New H-1B Visa Rules Upgrade Some Lottery Applicants — and Squeeze Out Others

Partner K. Edward Raleigh on how the $100K H‑1B fee factors into hiring international talent.

Learn more

Media mentions

China Daily: HK Softens Imbalance in Wealth Migration

Managing Director Magdalene Tennant and Director Kitty Lo highlight Hong Kong as an attractive destination for global investors.

Learn more

Blog post

Countdown to the Italy Winter Games 2026: What You Need to Know Before Travelling

IPM Business Process Manager Hazel Yaman outlines key visa, work authorisation and border considerations for athletes, media, event staff and spectators travelling to Italy for the Milan–Cortina 2026 Olympic and Paralympic Winter Games, including the impact of the EU’s new Entry/Exit System.

Learn more

Media mentions

Gulf News: Moving to the UAE from the UK? Here’s Your Visa Guide for Jobs, Business and Golden Visas

Corporate Services Director Elena Caron highlights key considerations for UK nationals moving to the UAE.

Learn more

Media mentions

People Management: The UK’s Earned Settlement Proposal: What HR Leaders Need to Know

Associates Charlotte Roberts and Karina Casey highlight how the UK’s earned settlement proposal may influence global talent and HR planning.

Learn more

Media mentions

Konfederacja Lewiatan: Procedura legalizacji zatrudnienia cudzoziemców w Polsce po zmianach w 2025 r.

Poland Immigration Strategy Director Tomasz Rogala contributes to Konfederacja Lewiatan’s analysis on 2025 changes to work permits and foreign employment in Poland.

Learn more

Blog post

F and J Visa Updates: Social Media Checks Begin as DHS Proposes New Limits

Associate Alejandro Hernandez analyses new F and J visa screening practices, including social media vetting by US consulates and proposed DHS changes that could significantly alter admission periods for students and exchange visitors.

Learn more

Awards

Fragomen Ireland Awarded the KeepWell Mark by IBEC

Fragomen Ireland is accredited with IBEC’s KeepWell Mark™, recognizing the practice’s commitment to wellbeing, inclusion and responsible business.

Learn more

Media mentions

Franceinfo: États-Unis : bientôt une inspection au peigne fin des réseaux sociaux avant d'entrer sur le territoire

Partner K. Edward Raleigh commented on proposed changes to US entry requirements.

Learn more

Video

The Schengen C Visa: What Non-EU Nationals Need to Know About 90/180-Day Travel

Business Immigration Consultant Marisa Gizzi from Fragomen explains everything about the Schengen C Visa: who needs it, how to apply and key travel tips to stay compliant in the Schengen Area. 

Learn more

Media mentions

Toronto Star: Canada Wants to Bring in 1,000 Researchers and Skilled Workers. Here’s What It Will Take

Partner Rick Lamanna discussed Canada’s $1B plan to attract global researchers.

Learn more

Blog post

Tier 1 Investor Visa Extension Deadline | February 2026 UK Update

Manager Alex Hood, Senior Associate Kimberley Ong and Immigration Paralegal Ataa Rajput explain the final extension and settlement deadlines for UK Tier 1 Investor visa holders and outline who can still qualify and why early action is essential.

Learn more

Media mentions

Business Insider: New H-1B Visa Rules Upgrade Some Lottery Applicants — and Squeeze Out Others

Partner K. Edward Raleigh on how the $100K H‑1B fee factors into hiring international talent.

Learn more

Media mentions

China Daily: HK Softens Imbalance in Wealth Migration

Managing Director Magdalene Tennant and Director Kitty Lo highlight Hong Kong as an attractive destination for global investors.

Learn more

Blog post

Countdown to the Italy Winter Games 2026: What You Need to Know Before Travelling

IPM Business Process Manager Hazel Yaman outlines key visa, work authorisation and border considerations for athletes, media, event staff and spectators travelling to Italy for the Milan–Cortina 2026 Olympic and Paralympic Winter Games, including the impact of the EU’s new Entry/Exit System.

Learn more

Media mentions

Gulf News: Moving to the UAE from the UK? Here’s Your Visa Guide for Jobs, Business and Golden Visas

Corporate Services Director Elena Caron highlights key considerations for UK nationals moving to the UAE.

Learn more

Media mentions

People Management: The UK’s Earned Settlement Proposal: What HR Leaders Need to Know

Associates Charlotte Roberts and Karina Casey highlight how the UK’s earned settlement proposal may influence global talent and HR planning.

Learn more

Media mentions

Konfederacja Lewiatan: Procedura legalizacji zatrudnienia cudzoziemców w Polsce po zmianach w 2025 r.

Poland Immigration Strategy Director Tomasz Rogala contributes to Konfederacja Lewiatan’s analysis on 2025 changes to work permits and foreign employment in Poland.

Learn more

Blog post

F and J Visa Updates: Social Media Checks Begin as DHS Proposes New Limits

Associate Alejandro Hernandez analyses new F and J visa screening practices, including social media vetting by US consulates and proposed DHS changes that could significantly alter admission periods for students and exchange visitors.

Learn more

Awards

Fragomen Ireland Awarded the KeepWell Mark by IBEC

Fragomen Ireland is accredited with IBEC’s KeepWell Mark™, recognizing the practice’s commitment to wellbeing, inclusion and responsible business.

Learn more

Stay in touch

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