Important Updates
Important Updates
May 21, 2025 | United StatesUnited States: Protecting Against Immigration Fraud Schemes
May 21, 2025 | United KingdomLBN: Youth Mobility is a Good Start - But Britain’s Immigration System Still Needs a Business Reset
May 21, 2025 | United StatesNegocios Now Names Associate Ana Gabriela Urizar to NYC-TriState Latinos 40 Under 40 Class of 2025
May 21, 2025 | South AfricaSouth Africa: Extended Duration of Stay for Nationals of Lesotho
May 21, 2025 | United Arab EmiratesUnited Arab Emirates: Reminder of 2025 Deadline for Mainland Private Sector Employers to Increase Emiratization Rate
May 21, 2025 | United StatesUnited States: Protecting Against Immigration Fraud Schemes
May 21, 2025 | United KingdomLBN: Youth Mobility is a Good Start - But Britain’s Immigration System Still Needs a Business Reset
May 21, 2025 | United StatesNegocios Now Names Associate Ana Gabriela Urizar to NYC-TriState Latinos 40 Under 40 Class of 2025
May 21, 2025 | South AfricaSouth Africa: Extended Duration of Stay for Nationals of Lesotho
May 21, 2025 | United Arab EmiratesUnited Arab Emirates: Reminder of 2025 Deadline for Mainland Private Sector Employers to Increase Emiratization Rate
May 21, 2025 | United StatesUnited States: Protecting Against Immigration Fraud Schemes
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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

LBN: Youth Mobility is a Good Start - But Britain’s Immigration System Still Needs a Business Reset

UK Managing Partner Nadine Goldfoot reflects on how the UK’s immigration system might adapt to better support business and short-term mobility.

Learn more

Awards

Negocios Now Names Associate Ana Gabriela Urizar to NYC-TriState Latinos 40 Under 40 Class of 2025

Negocios Now names Associate Ana Gabriela Urizar to its NYC-TriState Latinos 40 Under 40 Class of 2025 list.

Learn more

Video

Digital Nomad Visas Explained: How to Travel and Work Remotely

Learn the key requirements for digital nomad visas and find out which countries you can apply to as a remote worker or freelancer. 

Learn more

Media mentions

Financial Times Adviser: Relocating to the UK: An Immigration Lawyer’s Guide for US clients

Practice Leader Olga Nechita provides practical guidance on navigating UK immigration routes, settlement options and key considerations for applicants.

Learn more

Video

New DOLE Rules for Employing Foreign Nationals | #MobilityMinute

Senior Business Immigration Consultant Missy Mae Makil discusses the new DOLE rules for employing foreign nationals in the Philippines.

Learn more

Media mentions

Research Professional News: Immigration White Paper Offers Employers Costs without Clarity

UK Government Affairs Strategy Director Shuyeb Muquit examines how the UK’s new Immigration White Paper could affect talent mobility and growth in the life sciences sector.

Learn more

Media mentions

An Interview with Partner Abeer Al Husseini (الاقتصادية)

Partner Abeer Al Husseini discusses recent changes in Saudi Arabia's commercial regulations, their impact on international businesses and how they support Vision 2030.

Learn more

Awards

Fragomen and Talent Beyond Boundaries Win "Partnership with an International Charity" at Better Society 2025 Awards

Fragomen and Talent Beyond Boundaries received the “Partnership with an International Charity” award at the 10th Annual Better Society Awards.

Learn more

Blog post

Freelance Licence in the UAE: What You Need to Know in 2025

Corporate Services Director Elena Caron outlines essential information and updates regarding obtaining a freelance licence in the UAE, highlighting key requirements and benefits for freelancers.

Learn more

Media mentions

Global Mobility Lawyer: Immigration White Paper Sends Message That the UK is “Closed for Business”

Partner Rajiv Naik discussed how UK employers can prepare for immigration reforms by reviewing policies and aligning mobility with workforce planning.

Learn more

Blog post

A System Reset Presents Challenges and Opportunities: The UK’s Immigration White Paper in Focus

UK Government Affairs Strategy Director Shuyeb Muquit discusses how the UK’s Immigration White Paper presents both challenges and opportunities, highlighting the need for a system reset to address immigration issues effectively.

Learn more

Media mentions

AMCHAM Luxembourg: Interview – Virginie Todesco, Fragomen

Immigration Manager Virginie Todesco highlights how Luxembourg’s clear immigration system and strategic reforms attract global talent and employers.

Learn more

Media mentions

LBN: Youth Mobility is a Good Start - But Britain’s Immigration System Still Needs a Business Reset

UK Managing Partner Nadine Goldfoot reflects on how the UK’s immigration system might adapt to better support business and short-term mobility.

Learn more

Awards

Negocios Now Names Associate Ana Gabriela Urizar to NYC-TriState Latinos 40 Under 40 Class of 2025

Negocios Now names Associate Ana Gabriela Urizar to its NYC-TriState Latinos 40 Under 40 Class of 2025 list.

Learn more

Video

Digital Nomad Visas Explained: How to Travel and Work Remotely

Learn the key requirements for digital nomad visas and find out which countries you can apply to as a remote worker or freelancer. 

Learn more

Media mentions

Financial Times Adviser: Relocating to the UK: An Immigration Lawyer’s Guide for US clients

Practice Leader Olga Nechita provides practical guidance on navigating UK immigration routes, settlement options and key considerations for applicants.

Learn more

Video

New DOLE Rules for Employing Foreign Nationals | #MobilityMinute

Senior Business Immigration Consultant Missy Mae Makil discusses the new DOLE rules for employing foreign nationals in the Philippines.

Learn more

Media mentions

Research Professional News: Immigration White Paper Offers Employers Costs without Clarity

UK Government Affairs Strategy Director Shuyeb Muquit examines how the UK’s new Immigration White Paper could affect talent mobility and growth in the life sciences sector.

Learn more

Media mentions

An Interview with Partner Abeer Al Husseini (الاقتصادية)

Partner Abeer Al Husseini discusses recent changes in Saudi Arabia's commercial regulations, their impact on international businesses and how they support Vision 2030.

Learn more

Awards

Fragomen and Talent Beyond Boundaries Win "Partnership with an International Charity" at Better Society 2025 Awards

Fragomen and Talent Beyond Boundaries received the “Partnership with an International Charity” award at the 10th Annual Better Society Awards.

Learn more

Blog post

Freelance Licence in the UAE: What You Need to Know in 2025

Corporate Services Director Elena Caron outlines essential information and updates regarding obtaining a freelance licence in the UAE, highlighting key requirements and benefits for freelancers.

Learn more

Media mentions

Global Mobility Lawyer: Immigration White Paper Sends Message That the UK is “Closed for Business”

Partner Rajiv Naik discussed how UK employers can prepare for immigration reforms by reviewing policies and aligning mobility with workforce planning.

Learn more

Blog post

A System Reset Presents Challenges and Opportunities: The UK’s Immigration White Paper in Focus

UK Government Affairs Strategy Director Shuyeb Muquit discusses how the UK’s Immigration White Paper presents both challenges and opportunities, highlighting the need for a system reset to address immigration issues effectively.

Learn more

Media mentions

AMCHAM Luxembourg: Interview – Virginie Todesco, Fragomen

Immigration Manager Virginie Todesco highlights how Luxembourg’s clear immigration system and strategic reforms attract global talent and employers.

Learn more

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