Important Updates
Important Updates
December 1, 2025 | CanadaCanada: 2026 International Student Cap and Allocations Announced
December 2, 2025 | United StatesBloomberg Law: Labor Department Expands H-1B Oversight, Tests Enforcement Power
December 2, 2025 | United KingdomLeading Britain's Conversation: Is Settlement Reform Rewarding Contribution or Rewriting the Rules of Fairness and Trust?
December 2, 2025 | MalaysiaMalaysia: Mandatory Pass Validity Period Shortening and Exit Clearance Requirement Implemented
December 2, 2025 | 🌐Minimum Salary Changes Announced
December 1, 2025 | CanadaCanada: 2026 International Student Cap and Allocations Announced
December 2, 2025 | United StatesBloomberg Law: Labor Department Expands H-1B Oversight, Tests Enforcement Power
December 2, 2025 | United KingdomLeading Britain's Conversation: Is Settlement Reform Rewarding Contribution or Rewriting the Rules of Fairness and Trust?
December 2, 2025 | MalaysiaMalaysia: Mandatory Pass Validity Period Shortening and Exit Clearance Requirement Implemented
December 2, 2025 | 🌐Minimum Salary Changes Announced
December 1, 2025 | CanadaCanada: 2026 International Student Cap and Allocations 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, “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

Bloomberg Law: Labor Department Expands H-1B Oversight, Tests Enforcement Power

Partner K. Edward Raleigh explains that the Department of Labor’s Project Firewall expands H-1B oversight beyond individual complaints and increases the scope of employer compliance reviews.

Learn more

Media mentions

Leading Britain's Conversation: Is Settlement Reform Rewarding Contribution or Rewriting the Rules of Fairness and Trust?

UK Government Affairs Strategy Director Shuyeb Muquit examines how proposed settlement reforms could reshape the path to UK residency by extending qualifying periods and linking eligibility to individual contribution.

Learn more

Podcast

Canada's Healthcare Staffing Solution

Partner Cosmina Morariu and Business Immigration Manager Ayana Ibrahimi discuss critical immigration strategies underpinning healthcare-sector staffing in Canada, unpacking how recent policy, mobility and compliance developments are affecting employers and global talent pipelines.

Learn more

Awards

Fragomen Named Private Client Team of the Year at The British Legal Awards 2025

Fragomen named Private Client Team of the Year at The British Legal Awards 2025, recognising the strength of our UK Private Client practice.

Learn more

Media mentions

Global Mobility Lawyer: Rising Immigration Fraud Creates New Compliance Challenges for US Firms

Partner Daniel Brown highlights rising deceptive practices in immigration and emphasizes stronger verification and compliance measures for employers.

Learn more

Media mentions

The Caterer: Casual Staff to Come Under New Right to Work Check Legislation

Senior Manager Louise Senior highlights how proposed UK reforms could expand right to work checks across hospitality and reshape compliance for businesses.

Learn more

Video

Vuvuzelas, Visas and Victory - Moving Football Across Africa | #FragomenFC - Ep. 12

Rick Lamanna, Jake Paul Minster and Lunga Mani discuss Africa’s path to the 2026 World Cup.

Learn more

Media mentions

Bloomberg: UK to Create New Fast-Track Residency Path for High-Earners

Partner Louise Haycock notes that the UK’s new fast-track residency route for high earners could affect how businesses plan for immigration costs.

Learn more

Blog post

Georgia Immigration Reform 2025: New Residence Permit Scrutiny for Foreign Nationals

Senior Manager Zaur Gasimov outlines Georgia’s stricter residence-permit requirements and enhanced monitoring measures introduced under the country’s 2025 immigration reforms.

Learn more

Media mentions

Times Higher Education: Hertfordshire Latest to Be Placed on Student Visa ‘Action Plan’

Senior Manager Jonathan Hill explains why more UK universities are on UKVI student visa action plans and how extended timeframes help them address compliance issues.

Learn more

Media mentions

Gazeta Prawna: Cyfrowy odwrót. Wojewodowie chcą odzyskać kontrolę nad kolejkami

Partner Karolina Schiffter explains why Poland has paused online residence permit bookings and returned to paper-based submissions.

Learn more

Blog post

Swiss Immigration Quotas for 2026: What Employers and Workers Need to Know

Senior Manager Ana Bessa Santos outlines Switzerland’s 2026 immigration quotas and what employers should expect across non-EU/EFTA, EU/EFTA and UK permit categories.

Learn more

Media mentions

Bloomberg Law: Labor Department Expands H-1B Oversight, Tests Enforcement Power

Partner K. Edward Raleigh explains that the Department of Labor’s Project Firewall expands H-1B oversight beyond individual complaints and increases the scope of employer compliance reviews.

Learn more

Media mentions

Leading Britain's Conversation: Is Settlement Reform Rewarding Contribution or Rewriting the Rules of Fairness and Trust?

UK Government Affairs Strategy Director Shuyeb Muquit examines how proposed settlement reforms could reshape the path to UK residency by extending qualifying periods and linking eligibility to individual contribution.

Learn more

Podcast

Canada's Healthcare Staffing Solution

Partner Cosmina Morariu and Business Immigration Manager Ayana Ibrahimi discuss critical immigration strategies underpinning healthcare-sector staffing in Canada, unpacking how recent policy, mobility and compliance developments are affecting employers and global talent pipelines.

Learn more

Awards

Fragomen Named Private Client Team of the Year at The British Legal Awards 2025

Fragomen named Private Client Team of the Year at The British Legal Awards 2025, recognising the strength of our UK Private Client practice.

Learn more

Media mentions

Global Mobility Lawyer: Rising Immigration Fraud Creates New Compliance Challenges for US Firms

Partner Daniel Brown highlights rising deceptive practices in immigration and emphasizes stronger verification and compliance measures for employers.

Learn more

Media mentions

The Caterer: Casual Staff to Come Under New Right to Work Check Legislation

Senior Manager Louise Senior highlights how proposed UK reforms could expand right to work checks across hospitality and reshape compliance for businesses.

Learn more

Video

Vuvuzelas, Visas and Victory - Moving Football Across Africa | #FragomenFC - Ep. 12

Rick Lamanna, Jake Paul Minster and Lunga Mani discuss Africa’s path to the 2026 World Cup.

Learn more

Media mentions

Bloomberg: UK to Create New Fast-Track Residency Path for High-Earners

Partner Louise Haycock notes that the UK’s new fast-track residency route for high earners could affect how businesses plan for immigration costs.

Learn more

Blog post

Georgia Immigration Reform 2025: New Residence Permit Scrutiny for Foreign Nationals

Senior Manager Zaur Gasimov outlines Georgia’s stricter residence-permit requirements and enhanced monitoring measures introduced under the country’s 2025 immigration reforms.

Learn more

Media mentions

Times Higher Education: Hertfordshire Latest to Be Placed on Student Visa ‘Action Plan’

Senior Manager Jonathan Hill explains why more UK universities are on UKVI student visa action plans and how extended timeframes help them address compliance issues.

Learn more

Media mentions

Gazeta Prawna: Cyfrowy odwrót. Wojewodowie chcą odzyskać kontrolę nad kolejkami

Partner Karolina Schiffter explains why Poland has paused online residence permit bookings and returned to paper-based submissions.

Learn more

Blog post

Swiss Immigration Quotas for 2026: What Employers and Workers Need to Know

Senior Manager Ana Bessa Santos outlines Switzerland’s 2026 immigration quotas and what employers should expect across non-EU/EFTA, EU/EFTA and UK permit categories.

Learn more

Stay in touch

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