Mariana practices with Preti Flaherty’s Corporate and M&A and Immigration practice groups from the firm’s Portland office, where she focuses on mergers and acquisitions and general corporate matters, business immigration, and international tax issues. She advises clients in all stages of development–from start-ups and entrepreneurs to multinational companies–on complex domestic and international law issues, including cross-border corporate reorganizations and global mobility.

Mariana’s experience as an attorney in Argentina and her work for a law firm in Switzerland has given her unique perspective and insight into the complexities of multi-jurisdictional laws and regulations. Her clients appreciate her practical, business-centric mindset and value her real-world guidance. She has built longstanding relationships with clients, teaming with them both on complicated transactions spanning years, and the day-to-day issues that arise while running an international company.

Before joining Preti Flaherty, Mariana worked at a law firm in Boston, playing a key role in immigration cases before the Board of Immigration Appeals and the U.S. Courts of Appeals for the First, Third, and Eighth Circuits. Mariana served as a law clerk for the Hon. William G. Young at the U.S. District Court for the District of Massachusetts. She is a graduate of Boston College Law School, and Universidad Torcuato Di Tella and Universidad Austral in Buenos Aires, Argentina.

Mariana lives in Portland with her husband.

Professional Activities

  • American Immigration Lawyers Association
    • AILA Congressional Relations Liaison Committee, Member
  • Exchange Ideas, Board Member, 2020

Honors & Recognition

  • Katahdin Counsel Honoree for Pro Bono Service, Maine Supreme Judicial Court Justice Action Group, 2021

Civic and Charitable Activities

  • Immigrant Legal Advocacy Project

Firm Highlights


35,000 Additional H-2B Visas Now Available for the Second Half of Fiscal Year

On May 18, 2022, the Department of Homeland Security (DHS) and the Department of Labor (DOL) issued a temporary rule authorizing the issuance of additional 35,000 H-2B visas for the second half of Fiscal...


H-2B Temporary Visas: Additional 35,000 Coming in Second Half of FY 2022

The Department of Homeland Security (DHS) and the Department of Labor (DOL) recently announced the forthcoming publication of a joint temporary final rule to make available an additional 35,000 H-2B temporary nonagricultural worker visas...


Preti Flaherty Attorneys Recognized for ILAP Support

Several Preti Flaherty attorneys were recognized for their support by the The Immigrant Legal Advocacy Project (ILAP) in its  2021 Annual Report . ILAP's goal is to help low-income immigrants improve their legal status and promote...


What Are My Options If My H-1B Registration Was Not Selected?

The H-1B nonimmigrant visa category allows employers to sponsor foreign nationals performing work in a “specialty occupation.” This typically requires an offer of employment in a job requiring at least a U.S. bachelor’s degree...


Changes Affecting Employment Authorization for L-2, E, and H-4 Dependent Spouses

On November 12, 2021, USCIS announced that L-2 and E dependent spouses are no longer required to apply for an EAD to work in the United States. Instead, L-2 and E dependent spouses are...


Considerations When Terminating a Foreign Worker (H-1B, H-1B1, E-1/E-2, E-3, TN, L-1, O-1)

Terminating an employee is always a difficult decision. Terminating a foreign worker has additional challenges and consequences that must be considered, and employers must ensure they comply with state and federal law. An employer...


FY2024 H-1B Registration Fact Sheet for Employers

Registration Process To file H-1B petitions subject to the FY2024 cap for an employee, you must first electronically register and pay a $10 fee for each electronic registration. The electronic registration includes basic information about...


Preti Flaherty Announces Attorneys Kristy Abraham and Mariana Baron Promoted to Partner

Preti Flaherty is pleased to announce that the firm’s partnership has named two new partners: Kristy Abraham and Mariana Baron. Both attorneys stand out as distinguished practitioners in the field of corporate law and...