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August 18, 2025 | AustraliaAustralia: Updates to National Innovation Visa Programs in New South Wales, South Australia and Victoria
August 18, 2025 | United StatesPittsburgh Business Times: Viewpoint: Immigration Compliance: A Strategic Imperative for Today’s Employers
August 18, 2025 | United Arab EmiratesUnited Arab Emirates: New Advertiser Permit Required for Some Social Media Promotional Content
August 14, 2025 | AustraliaAustralia: English Language Test Requirement Updated
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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

Explore more at Fragomen

Media mentions

Pittsburgh Business Times: Viewpoint: Immigration Compliance: A Strategic Imperative for Today’s Employers

Pittsburgh Managing Partner Alex Castrodale and Associate Adam Teets highlight the need for US employers to prepare for unannounced immigration compliance checks.

Learn more

Blog post

From Ground Staff to Game Day: UK Skilled Worker Visa Changes in 2025 and the Impact on the Hidden Workforce in Sports Sector

Associates Stephanie Fitton and Halil Kaya and Paralegal Marcus Alexander Lang-Rawlings discuss how UK changes to the Skilled Worker visa in 2025 are reshaping sports sector employment.

Learn more

Blog post

Talent & Policy: Navigating Career Beginnings and Hiring Challenges in Singapore

Assistant Business Immigration Managers Jeszel Panistante-Cabral, Elsie Lim and Nellanie Quimson explore the complexities young professionals face entering the workforce and the evolving hiring landscape in Singapore.

Learn more

Blog post

Global Mobility Support and Visa Services: Fragomen’s Outbound Solutions from Germany

Director David Iannella discusses Fragomen Germany’s approach to outbound immigration solutions and how the office supports global mobility through visa services and compliance expertise.

Learn more

Blog post

Lifting the Curtain: Saudi Arabia Demands Full Disclosure of Real Company Owners

Corporate Services Manager Asfandyar Sheikh and Assistant Corporate Services Manager Ka-Ying Leung discuss Saudi Arabia’s push for corporate transparency through new ownership disclosure rules.

Learn more

Video

Fragomen's Posted Worker Compliance Solutions

In this video, we share an overview of Fragomen's posted worker compliance solutions.

Learn more

Blog post

From Facilitation to Surveillance: How Digitalization Will Impact Your European Compliance Program

Partner Jo Antoons and Managers Sara Fekete and Andreia Florina Ghimis explore how digitalization is reshaping European compliance programs and share how organizations can prepare with Fragomen’s support.

Learn more

Media mentions

People Management: What the UK’s Industrial Strategy and Immigration Reforms Mean for Employers

Partner Rajiv Naik examines how the UK’s industrial strategy and immigration reforms will reshape talent access and create new opportunities for HR and mobility teams.

Learn more

Media mentions

NBC Bay Area: H-1B Visa Holders Will Be Required to Renew in Person Starting in September

Partner Audrea Golding discusses recent changes requiring most H-1B visa holders and certain dependents to complete in-person interviews abroad for visa renewals.

Learn more

Podcast

New Roots: Pathways to Canada - Economic Mobility in Action - Canada's EMPP Unpacked

Partner Cosmina Morariu and Business Immigration Manager Ayana Ibrahimi are joined by Lara Dyer, Chief Program Officer (Americas) at Talent Beyond Boundaries, to explore Canada’s EMPP.

Learn more

Blog post

Restored Citizenship: What Former South Africans Need to Know

Director Johannes Kgotso Tiba explains the legal process and key considerations for individuals seeking to regain South African citizenship after renunciation or loss.

Learn more

Blog post

From Advocacy to Action: Vietnam’s New Work Permit Decree Takes Shape

Partner Kenneth Lau discusses the development and implications of Vietnam's updated work permit regulations.

Learn more

Media mentions

Pittsburgh Business Times: Viewpoint: Immigration Compliance: A Strategic Imperative for Today’s Employers

Pittsburgh Managing Partner Alex Castrodale and Associate Adam Teets highlight the need for US employers to prepare for unannounced immigration compliance checks.

Learn more

Blog post

From Ground Staff to Game Day: UK Skilled Worker Visa Changes in 2025 and the Impact on the Hidden Workforce in Sports Sector

Associates Stephanie Fitton and Halil Kaya and Paralegal Marcus Alexander Lang-Rawlings discuss how UK changes to the Skilled Worker visa in 2025 are reshaping sports sector employment.

Learn more

Blog post

Talent & Policy: Navigating Career Beginnings and Hiring Challenges in Singapore

Assistant Business Immigration Managers Jeszel Panistante-Cabral, Elsie Lim and Nellanie Quimson explore the complexities young professionals face entering the workforce and the evolving hiring landscape in Singapore.

Learn more

Blog post

Global Mobility Support and Visa Services: Fragomen’s Outbound Solutions from Germany

Director David Iannella discusses Fragomen Germany’s approach to outbound immigration solutions and how the office supports global mobility through visa services and compliance expertise.

Learn more

Blog post

Lifting the Curtain: Saudi Arabia Demands Full Disclosure of Real Company Owners

Corporate Services Manager Asfandyar Sheikh and Assistant Corporate Services Manager Ka-Ying Leung discuss Saudi Arabia’s push for corporate transparency through new ownership disclosure rules.

Learn more

Video

Fragomen's Posted Worker Compliance Solutions

In this video, we share an overview of Fragomen's posted worker compliance solutions.

Learn more

Blog post

From Facilitation to Surveillance: How Digitalization Will Impact Your European Compliance Program

Partner Jo Antoons and Managers Sara Fekete and Andreia Florina Ghimis explore how digitalization is reshaping European compliance programs and share how organizations can prepare with Fragomen’s support.

Learn more

Media mentions

People Management: What the UK’s Industrial Strategy and Immigration Reforms Mean for Employers

Partner Rajiv Naik examines how the UK’s industrial strategy and immigration reforms will reshape talent access and create new opportunities for HR and mobility teams.

Learn more

Media mentions

NBC Bay Area: H-1B Visa Holders Will Be Required to Renew in Person Starting in September

Partner Audrea Golding discusses recent changes requiring most H-1B visa holders and certain dependents to complete in-person interviews abroad for visa renewals.

Learn more

Podcast

New Roots: Pathways to Canada - Economic Mobility in Action - Canada's EMPP Unpacked

Partner Cosmina Morariu and Business Immigration Manager Ayana Ibrahimi are joined by Lara Dyer, Chief Program Officer (Americas) at Talent Beyond Boundaries, to explore Canada’s EMPP.

Learn more

Blog post

Restored Citizenship: What Former South Africans Need to Know

Director Johannes Kgotso Tiba explains the legal process and key considerations for individuals seeking to regain South African citizenship after renunciation or loss.

Learn more

Blog post

From Advocacy to Action: Vietnam’s New Work Permit Decree Takes Shape

Partner Kenneth Lau discusses the development and implications of Vietnam's updated work permit regulations.

Learn more

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