Important Updates
Important Updates
June 11, 2025 | IrelandIrish Legal News: Fragomen Opens Second Office in Cork
June 11, 2025 | CanadaCanada: Ontario Provincial Nominee Allocation Significantly Reduced for 2025
June 11, 2025 | ColombiaColombia: Immigration Processing Delays and Closures due to Earthquake
June 11, 2025 | United KingdomConstruction News: The Immigration White Paper: What Builders Need to Know
June 11, 2025 | FinlandFinland: New End-of-Employment Notification Rule and New Job-Seeking Deadline
June 11, 2025 | IrelandIrish Legal News: Fragomen Opens Second Office in Cork
June 11, 2025 | CanadaCanada: Ontario Provincial Nominee Allocation Significantly Reduced for 2025
June 11, 2025 | ColombiaColombia: Immigration Processing Delays and Closures due to Earthquake
June 11, 2025 | United KingdomConstruction News: The Immigration White Paper: What Builders Need to Know
June 11, 2025 | FinlandFinland: New End-of-Employment Notification Rule and New Job-Seeking Deadline
June 11, 2025 | IrelandIrish Legal News: Fragomen Opens Second Office in Cork
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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

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Bloomberg: UK’s Visa Crackdown Leaves City of London Immigrants in Limbo

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Partner Daniel Pierce notes that limited social media activity or private accounts could lead to greater scrutiny for international students applying for US visas.

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Global Mobility Lawyer recognises Senior Immigration Manager Wout van Doren and Manager Tanya Loughran as Tomorrow's Leaders.

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Media mentions

Construction News: The Immigration White Paper: What Builders Need to Know

Senior Associate Clara Gautrais and Immigration Paralegal Sean Pearce outline the impact of new visa skill requirements and sponsorship rules on UK construction firms.

Learn more

Video

European Club Season Wrap Up & Looking Forward to the 2025 Club World Cup | #FragomenFCLearn more

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Irish Legal News: Fragomen Opens Second Office in Cork

This article in Irish Legal News covers the firm's recent announcement of its new office opening in Cork, Ireland.

Learn more
Generic Insights

Media mentions

Kiplinger: Retire in Finland and Live the Nordic Dream

Director Audrey Morew outlines how US retirees may apply for Finnish residency under the “residence permit on other grounds” route.

Learn more

Media mentions

Bloomberg: UK’s Visa Crackdown Leaves City of London Immigrants in Limbo

Partner Louise Haycock explains how the UK’s decision to double the qualifying period for Indefinite Leave to Remain is creating uncertainty for international talent and increasing pressure on employers.

Learn more

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Fragomen Appoints Partner Daniel Brown to Lead its WorkRight U.S. I-9 Technology Solution

Fragomen announces the appointment of Partner Daniel Brown to the position of Chief Executive Officer of WorkRight U.S., the firm’s I-9 employee verification technology.

Learn more

Fragomen news

Fragomen Ranked in Chambers USA 2025

Fragomen earned top rankings in Chambers USA 2025, with Band 1 recognition nationally.

Learn more

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The Hollywood Reporter: Will Trump Torch L.A.’s Olympics?

San Diego Managing Partner Karine Wenger discussed the upcoming Olympic immigration landscape and potential challenges for international participants.

Learn more

Media mentions

Business Standard: Could Social Media Silence Cost You a US Student Visa? Experts Weigh In

Partner Daniel Pierce notes that limited social media activity or private accounts could lead to greater scrutiny for international students applying for US visas.

Learn more

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Fragomen Grows Irish Operations with New Cork Office

Fragomen announces the opening of a new office in Cork, expanding its presence in Ireland to better support clients across the country's southern and western regions.

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Fragomen is ranked both nationally and locally in "Best Law Firms in Australia" by The Best Lawyers.

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Global Mobility Lawyer Recognises Fragomen's Wout van Doren and Tanya Loughran as Tomorrow's Leaders

Global Mobility Lawyer recognises Senior Immigration Manager Wout van Doren and Manager Tanya Loughran as Tomorrow's Leaders.

Learn more

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