Important Updates
Important Updates
May 22, 2026 | United Arab EmiratesUnited Arab Emirates: Tougher Wage Protection System Rules Forthcoming
May 22, 2026 | United StatesABA Journal: Will US Immigration Policies Create ‘Chilling Effect’ on World Cup?
May 22, 2026 | European UnionEuropean Union/Schengen Area: Internal Schengen Border Checks Situation
May 22, 2026Middle East/Africa: Temporary Ebola-Related Entry Restrictions Introduced
May 22, 2026 | 🌐Minimum Salary Changes Announced
May 22, 2026 | United Arab EmiratesUnited Arab Emirates: Tougher Wage Protection System Rules Forthcoming
May 22, 2026 | United StatesABA Journal: Will US Immigration Policies Create ‘Chilling Effect’ on World Cup?
May 22, 2026 | European UnionEuropean Union/Schengen Area: Internal Schengen Border Checks Situation
May 22, 2026Middle East/Africa: Temporary Ebola-Related Entry Restrictions Introduced
May 22, 2026 | 🌐Minimum Salary Changes Announced
May 22, 2026 | United Arab EmiratesUnited Arab Emirates: Tougher Wage Protection System Rules Forthcoming
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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

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  • English

Contact information

Email

[email protected]

T:+44 (0)207 090 9272

F:+44 (0)207 090 9101

Fragomen in London

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1st Floor, 95 Gresham St,

London EC2V 7NA

United Kingdom

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  • English

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Email

[email protected]

T:+44 (0)207 090 9272

F:+44 (0)207 090 9101

Fragomen in 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

Fragomen in London

Fragomen LLP

1st Floor, 95 Gresham St,

London EC2V 7NA

United Kingdom

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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

Fragomen in 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

Fragomen in 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

Fragomen in 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

Media mentions

ABA Journal: Will US Immigration Policies Create ‘Chilling Effect’ on World Cup?

Partner Daniel Schwarz highlights how US visa appointment backlogs and limited availability for B visas are shaping international travel planning for the upcoming World Cup.

Learn more

Article

Saudi Arabia: Premium Residency, Property Ownership and Compensation Structuring Under Vision 2030 - Part 2

Destination Services Director Christine Sperr examines how Saudi Arabia’s evolving Premium Residency framework and newly expanded foreign property ownership rules are reshaping the Kingdom’s appeal for internationally mobile professionals, global employers and institutional investors.

Learn more

Media mentions

Daily Mail: The Great Midlife Exodus to Portugal

Practice Leader Olga Nechita outlines key Portuguese visa options for UK nationals, including routes for entrepreneurs and retirees, alongside basic income and residency requirements.

Learn more

Video

June 2026 Visa Bulletin

Partner Melissa Vasquez-Myers reviews the June 2026 Visa Bulletin, including retrogression for EB2 and EB1 India and forward movement in the EB3 category for Indian and Chinese nationals.

Learn more

Media mentions

Bloomberg Law: ICE Raises the Stakes for Employers’ I-9 Compliance Failures

Partner Daniel Brown discussed how updated Immigration and Customs Enforcement guidance could increase employer exposure to I-9 compliance penalties.

Learn more

Awards

Canada Managing Partner Cosmina Morariu Recognized Among Top Women Leaders of Toronto for 2026

Canada Managing Partner Cosmina Morariu is recognized by Women We Admire among the Top Women Leaders of Toronto for 2026 for her leadership in immigration and global mobility.

Learn more

Video

How to Hire International Employees in the UK: Visas Explained for Employers

Senior Manager Harry Goldstraw outlines key considerations for UK employers hiring international talent, including sponsorship requirements, visa pathways and compliance obligations shaping workforce mobility strategy.

Learn more

Article

The Myth of A1 Simplification: Why EU Business Travel Compliance Is Becoming More Complex

Senior Counsel Jo Antoons examines how the EU’s proposed social security reforms are reshaping A1 compliance for business travel, introducing “Day One” requirements and greater complexity.

Learn more

Awards

Fragomen Wins 2026 FEM Americas EMMAs for Outstanding Agility & Crisis Management and Thought Leadership

Fragomen is recognized with multiple honors at the 2026 FEM Americas EMMAs, including Outstanding Agility & Crisis Management as a Service Provider and Thought Leadership – Best Survey or Research Study of the Year for the Worldwide Immigration Trends Report 2026.

Learn more

Blog post

Housing Market Dynamics in Saudi Arabia: Policy Changes, Rent Stabilization and Cost of Living Implications for Employers - Part 1

Destination Services Director Christine Sperr examines how housing market reforms, rent stabilization measures and cost-of-living dynamics in Saudi Arabia are influencing workforce mobility, compensation planning and long-term settlement strategies under Vision 2030.

Learn more

Visas

German Visa Risks: What Past Unauthorised Employment Means for Your Visa Application

Manager Dr. Adela Schmidt explains how German authorities assess past travel and business activities and why suspected unauthorized work during prior visits can lead to visa refusals and temporary entry bans.

Learn more

Video

Romania Launches Unified Work Permit System | #MobilityMinute

Assistant Manager Sukhjeet Kaur discusses Romania’s proposed immigration reforms, including new visa categories, employer authorization requirements and a new digital immigration platform.

Learn more

Media mentions

ABA Journal: Will US Immigration Policies Create ‘Chilling Effect’ on World Cup?

Partner Daniel Schwarz highlights how US visa appointment backlogs and limited availability for B visas are shaping international travel planning for the upcoming World Cup.

Learn more

Article

Saudi Arabia: Premium Residency, Property Ownership and Compensation Structuring Under Vision 2030 - Part 2

Destination Services Director Christine Sperr examines how Saudi Arabia’s evolving Premium Residency framework and newly expanded foreign property ownership rules are reshaping the Kingdom’s appeal for internationally mobile professionals, global employers and institutional investors.

Learn more

Media mentions

Daily Mail: The Great Midlife Exodus to Portugal

Practice Leader Olga Nechita outlines key Portuguese visa options for UK nationals, including routes for entrepreneurs and retirees, alongside basic income and residency requirements.

Learn more

Video

June 2026 Visa Bulletin

Partner Melissa Vasquez-Myers reviews the June 2026 Visa Bulletin, including retrogression for EB2 and EB1 India and forward movement in the EB3 category for Indian and Chinese nationals.

Learn more

Media mentions

Bloomberg Law: ICE Raises the Stakes for Employers’ I-9 Compliance Failures

Partner Daniel Brown discussed how updated Immigration and Customs Enforcement guidance could increase employer exposure to I-9 compliance penalties.

Learn more

Awards

Canada Managing Partner Cosmina Morariu Recognized Among Top Women Leaders of Toronto for 2026

Canada Managing Partner Cosmina Morariu is recognized by Women We Admire among the Top Women Leaders of Toronto for 2026 for her leadership in immigration and global mobility.

Learn more

Video

How to Hire International Employees in the UK: Visas Explained for Employers

Senior Manager Harry Goldstraw outlines key considerations for UK employers hiring international talent, including sponsorship requirements, visa pathways and compliance obligations shaping workforce mobility strategy.

Learn more

Article

The Myth of A1 Simplification: Why EU Business Travel Compliance Is Becoming More Complex

Senior Counsel Jo Antoons examines how the EU’s proposed social security reforms are reshaping A1 compliance for business travel, introducing “Day One” requirements and greater complexity.

Learn more

Awards

Fragomen Wins 2026 FEM Americas EMMAs for Outstanding Agility & Crisis Management and Thought Leadership

Fragomen is recognized with multiple honors at the 2026 FEM Americas EMMAs, including Outstanding Agility & Crisis Management as a Service Provider and Thought Leadership – Best Survey or Research Study of the Year for the Worldwide Immigration Trends Report 2026.

Learn more

Blog post

Housing Market Dynamics in Saudi Arabia: Policy Changes, Rent Stabilization and Cost of Living Implications for Employers - Part 1

Destination Services Director Christine Sperr examines how housing market reforms, rent stabilization measures and cost-of-living dynamics in Saudi Arabia are influencing workforce mobility, compensation planning and long-term settlement strategies under Vision 2030.

Learn more

Visas

German Visa Risks: What Past Unauthorised Employment Means for Your Visa Application

Manager Dr. Adela Schmidt explains how German authorities assess past travel and business activities and why suspected unauthorized work during prior visits can lead to visa refusals and temporary entry bans.

Learn more

Video

Romania Launches Unified Work Permit System | #MobilityMinute

Assistant Manager Sukhjeet Kaur discusses Romania’s proposed immigration reforms, including new visa categories, employer authorization requirements and a new digital immigration platform.

Learn more

Stay in touch

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