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, “Leading Britain’s Conversation: One Old Arrest Can Stop You Entering the USA, Even If You Were Never Convicted.” Fragomen, 16 March 2026.

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

March 16, 2026 | Media mentions

Leading Britain's Conversation: One Old Arrest Can Stop You Entering the USA, Even If You Were Never ConvictedRead more

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
More related insights

William’s insights

March 16, 2026 | Media mentions

Leading Britain's Conversation: One Old Arrest Can Stop You Entering the USA, Even If You Were Never ConvictedRead more

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
More related insights

William’s insights

March 16, 2026 | Media mentions

Leading Britain's Conversation: One Old Arrest Can Stop You Entering the USA, Even If You Were Never ConvictedRead more

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
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

March 16, 2026 | Media mentions

Leading Britain's Conversation: One Old Arrest Can Stop You Entering the USA, Even If You Were Never ConvictedRead more

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
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

March 16, 2026 | Media mentions

Leading Britain's Conversation: One Old Arrest Can Stop You Entering the USA, Even If You Were Never ConvictedRead more

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
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

March 16, 2026 | Media mentions

Leading Britain's Conversation: One Old Arrest Can Stop You Entering the USA, Even If You Were Never ConvictedRead more

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
More related insights

Share

  • Twitter
  • Facebook
  • LinkedIn

Share

  • Twitter
  • Facebook
  • LinkedIn

Explore more at Fragomen

Fragomen news

Comment on DHS Proposed $103,265 Fee on Cap-Subject H-1B Petitions.Learn more

Awards

Fragomen Receives Three 2026 Cartus Awards

Fragomen received three recognitions at the 2026 Cartus Global Network Conference for excellence in service, sustainability leadership and global citizenship.

Learn more
Generic Insights

Blog post

Net Migration Policy: An Explainer Comparing Australia, Canada and the UK

Partner Jack (Eui Chul) Kim, Senior Counsel Dr. Anna Boucher, UK Government Affairs Strategy Director Shuyeb Muquit and Articling Student David Mucz examine how Australia, Canada and the UK measure net migration. They compare efforts to reduce migration with the need to maintain access to international talent, and explain the potential effects on employers, labor markets and economic growth.

Learn more

Media mentions

Bloomberg Law: White House H-1B Order Puts Employer Layoffs Under Microscope

Partner K. Edward Raleigh discusses how US employers should consider displacement and conduct a risk analysis when assessing H-1B filings in light of recent policy changes.

Learn more

Blog post

The Compliance Risks of International Remote Working and Hush Trips

International remote working can offer valuable flexibility, but undisclosed “hush trips” may expose employers to immigration, social security, insurance, employment-law and tax risks that they cannot properly assess or manage.

Learn more

Blog post

The Narrowing Talent Pipeline: From International Student to Corporate America

Counsel Susan Steger examines recent policy changes and litigation affecting the pathway from F-1 study and practical training through H-1B sponsorship and permanent residence, and the considerations for US employers recruiting and retaining early-career international talent.

Learn more

Media mentions

The National Interest: How Boosting Your Privacy Will Make America More Secure

Managing Director, Digital Identity Amit Sharma explores how digital identity can strengthen privacy and security.

Learn more

Media mentions

CEDA: The Drive to Reduce Net Overseas Migration and the Challenges for Business

Managing Partner, Australia and New Zealand Teresa Liu discusses how Australia’s efforts to reduce net overseas migration are affecting businesses amid ongoing skilled workforce shortages.

Learn more

Media mentions

Australian Broadcasting Corporation: Overnights

Senior Counsel Dr. Anna Boucher discusses Australia’s net migration figures and recent changes to the country’s migration policies.

Learn more

Blog post

Can International Graduates in the Netherlands Qualify for the 30% Ruling? Eligibility Rules Explained

Tiemen Peters, Silvia Norte Mercade and Soraya Driessen outline when international graduates who studied in the Netherlands may qualify for the 30% ruling and the key eligibility, timing and compliance considerations for graduates and employers.

Learn more

Blog post

Right to Work Changes: What Do They Mean for Employers in Northern England?

Manager Ko Ito, Senior Immigration Consultant Danielle Barks, Associate Naureen Malik and Trainee Solicitor Amna Ali outline how the expanded UK Right to Work Scheme could affect employers in Northern England and the practical steps businesses can take ahead of the 1 October 2026 changes.

Learn more

Media mentions

Business Traveller: Six Months in, the EU’s Entry/Exit System Isn’t Working

Partner Christine Sullivan discusses the implementation of the EU’s Entry/Exit System (EES) across member states and at border crossing points.

Learn more

Fragomen news

Comment on DHS Proposed $103,265 Fee on Cap-Subject H-1B Petitions.Learn more

Awards

Fragomen Receives Three 2026 Cartus Awards

Fragomen received three recognitions at the 2026 Cartus Global Network Conference for excellence in service, sustainability leadership and global citizenship.

Learn more
Generic Insights

Blog post

Net Migration Policy: An Explainer Comparing Australia, Canada and the UK

Partner Jack (Eui Chul) Kim, Senior Counsel Dr. Anna Boucher, UK Government Affairs Strategy Director Shuyeb Muquit and Articling Student David Mucz examine how Australia, Canada and the UK measure net migration. They compare efforts to reduce migration with the need to maintain access to international talent, and explain the potential effects on employers, labor markets and economic growth.

Learn more

Media mentions

Bloomberg Law: White House H-1B Order Puts Employer Layoffs Under Microscope

Partner K. Edward Raleigh discusses how US employers should consider displacement and conduct a risk analysis when assessing H-1B filings in light of recent policy changes.

Learn more

Blog post

The Compliance Risks of International Remote Working and Hush Trips

International remote working can offer valuable flexibility, but undisclosed “hush trips” may expose employers to immigration, social security, insurance, employment-law and tax risks that they cannot properly assess or manage.

Learn more

Blog post

The Narrowing Talent Pipeline: From International Student to Corporate America

Counsel Susan Steger examines recent policy changes and litigation affecting the pathway from F-1 study and practical training through H-1B sponsorship and permanent residence, and the considerations for US employers recruiting and retaining early-career international talent.

Learn more

Media mentions

The National Interest: How Boosting Your Privacy Will Make America More Secure

Managing Director, Digital Identity Amit Sharma explores how digital identity can strengthen privacy and security.

Learn more

Media mentions

CEDA: The Drive to Reduce Net Overseas Migration and the Challenges for Business

Managing Partner, Australia and New Zealand Teresa Liu discusses how Australia’s efforts to reduce net overseas migration are affecting businesses amid ongoing skilled workforce shortages.

Learn more

Media mentions

Australian Broadcasting Corporation: Overnights

Senior Counsel Dr. Anna Boucher discusses Australia’s net migration figures and recent changes to the country’s migration policies.

Learn more

Blog post

Can International Graduates in the Netherlands Qualify for the 30% Ruling? Eligibility Rules Explained

Tiemen Peters, Silvia Norte Mercade and Soraya Driessen outline when international graduates who studied in the Netherlands may qualify for the 30% ruling and the key eligibility, timing and compliance considerations for graduates and employers.

Learn more

Blog post

Right to Work Changes: What Do They Mean for Employers in Northern England?

Manager Ko Ito, Senior Immigration Consultant Danielle Barks, Associate Naureen Malik and Trainee Solicitor Amna Ali outline how the expanded UK Right to Work Scheme could affect employers in Northern England and the practical steps businesses can take ahead of the 1 October 2026 changes.

Learn more

Media mentions

Business Traveller: Six Months in, the EU’s Entry/Exit System Isn’t Working

Partner Christine Sullivan discusses the implementation of the EU’s Entry/Exit System (EES) across member states and at border crossing points.

Learn more
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September 23, 2026 | South AfricaSouth Africa: New Law Would Increase Locals in Labor Market
September 24, 2026Comment on DHS Proposed $103,265 Fee on Cap-Subject H-1B Petitions.
September 24, 2026 | CanadaFragomen Receives Three 2026 Cartus Awards
September 24, 2026 | 🌐Middle East - The Latest News on Mobility and Travel Considerations
September 24, 2026 | QatarQatar: Wage Protection System Rules Amended
September 23, 2026 | South AfricaSouth Africa: New Law Would Increase Locals in Labor Market
September 24, 2026Comment on DHS Proposed $103,265 Fee on Cap-Subject H-1B Petitions.
September 24, 2026 | CanadaFragomen Receives Three 2026 Cartus Awards
September 24, 2026 | 🌐Middle East - The Latest News on Mobility and Travel Considerations
September 24, 2026 | QatarQatar: Wage Protection System Rules Amended
September 23, 2026 | South AfricaSouth Africa: New Law Would Increase Locals in Labor Market
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