
Mary Cecilia Sweeney
Attorney
Sector: US Immigration
Location: London
MC is an attorney with the US team in London. Her practice areas include advising and preparing all categories of non-immigrant and immigrant cases, with particular emphasis on L-1 intra-company transfers and Blanket petitions, E-1 and E-2 treaty investors, O-1 persons with extraordinary ability, waivers of inadmissibility, EB-1 and family-based green cards. MC also advises on US citizenship matters including renunciation. Before joining LDI, she specialized in US litigation as a partner with boutique law firm Kaplan Landau LLP in New York.
History
2021-present – Laura Devine Immigration, London
2008-2017 – Kaplan & Landau LLP, New York
2006-2008 – Sullivan & Worcester LLP, New York
2003-2006 – Weil, Gotshal & Manges LLP, New York
Education
2004 – Admitted to the U.S. Federal Courts of the Eastern and Southern Districts of New York
2004 – Admitted to State Bar of New York
1999-2003 – Juris Doctorate, Fordham University School of Law, New York
Latest Insights
20 February 2026
The new era of UK immigration?: Lessons from 2025 and looking ahead in 2026
2025 marked the most consequential year for the immigration law sector since Brexit. Indeed, the scale of changes in 2025 and those likely to unfold…
12 February 2026
US immigration update – Proposed dual citizenship legislation
Recent proposals in the United States Congress have sparked attention around dual nationality, but at this stage nothing has changed in the law that…
9 February 2026
Christi Jackson quoted in The Financial Times on increasing US visa restrictions
Christi Hufford Jackson has been quoted in the Financial Times in an article titled 'US embassy in London denies visas to executives over minor…
