Mayer Brown is a distinctively global law firm, uniquely positioned to advise the world’s leading companies and financial institutions on their most complex deals and disputes.
With extensive reach across four continents, we are the only integrated law firm in the world with approximately 200 lawyers in each of the world’s three largest financial centers—New York, London and Hong Kong—the backbone of the global economy.
We have deep experience in high-stakes litigation and complex transactions across industry sectors, including our signature strength, the global financial services industry.
Our diverse teams of lawyers are recognized by our clients as strategic partners with deep commercial instincts and a commitment to creatively anticipating their needs and delivering excellence in everything we do.
Donoso & Associates is nationally recognized as a leading business immigration law firm with particular expertise in visas for professionals, researchers, investors, professional athletes and families who seek experienced guidance on how to obtain appropriate work visas or green card status in the United States.
Timothy D’Arduini is an associate in Mayer Brown’s Washington DC office and a member of the Employment & Benefits practice focusing on global mobility and immigration. He assists Fortune 500 clients in the financial services, healthcare, insurance, defense and information technology industries to develop and execute global mobility strategies for their work corps. Tim has experience with business visitor, work permit and resident permit requirements in multiple jurisdictions including Brazil, Canada, China, Iraq and the United Kingdom. He also has advised multinational corporations on the impact of corporate transactions on work and resident permit holders on assignment in jurisdictions across the globe.
He has deep knowledge of the legal requirements and procedures for processing nonimmigrant visas, PERM Labor Certification applications, immigrant visas, adjustment of status applications, naturalization applications and waivers of admissibility before the Department of Labor, US Citizenship & Immigration Services and the Department of State. He also has significant experience with O-1 nonimmigrant and EB 1A immigrant visa petitions (extraordinary ability) for business executives, research scientists, award-winning television screenwriters, actors, musicians and chefs.
Tim has been involved with US District Court for the District of Columbia and US Court of Appeals for the DC Circuit litigations on issues involving the interpretation of L-1B (specialized knowledge) and H-2B (temporary non-agricultural workers) regulations.
Prior to joining Mayer Brown, Tim served as a Law Clerk for Senior Associate Justice Jaynee LaVecchia of the Supreme Court of the State of New Jersey and as a Marsha Wenk Public Interest Law Fellow at the American Civil Liberties Union of New Jersey. He also has extensive experience working in multidisciplinary and boutique law firm practices, as well as at immigration legal services organizations.
Ignacio A. Donoso, Esq., is Managing Partner of Donoso & Associates, LLC. Mr. Donoso is nationally recognized as a leading business immigration attorney, with particular expertise in investors, researchers, start-ups, skilled professional and athletes. Mr. Donoso founded Donoso & Associates in 2013, after working as Partner of, one of the top immigration law firms in the U.S. Mr. Donoso’s career spans 24 years as a member of the State Bar of California, of which he has dedicated the last 16 years (since 2003) exclusively to immigration law. Since 2003, Mr. Donoso has successfully represented Fortune 500 companies and their employees, skilled workers, professors and researchers, professionals, athletes, artists and thousands of investors in their U.S. visa planning. Mr. Donoso has been selected to serve in many AILA National Committees including the Texas Service Center Liaison Committee, the National Annual Conference Planning Committee, and from 2013-2018, Mr. Donoso has served on the National EB-5 Committee. Mr. Donoso has been recognized among the Top 25 immigration attorneys in the United States for investor visas in 2015, 2016 and 2018. Mr. Donoso is a frequent speaker at national and international conferences on U.S. immigration law and has frequently published on specific issues related to immigration matters.