Giovanni Iammarrone

A trusted advisor on cross-border matters between Italy and the United States, Giovanni Iammarrone is a dual-licensed Certified Public Accountant in both jurisdictions and a Partner at One Advisors & Accountants Inc., with offices in New York and Los Angeles. He established his U.S. practice in 2021, building on over 15 years of experience in international tax and advisory.​

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He advises high-net-worth individuals, entrepreneurs, and companies on cross-border transactions, including tax structuring, U.S. market entry, and ongoing compliance. He has experience supporting Italian mid-sized companies expanding into the U.S. and assisting clients with M&A transactions involving the acquisition and sale of U.S. businesses.

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He began his career in Big 4 firms and developed expertise in transfer pricing and international advisory, positioning himself as a strategic bridge between the Italian and U.S. business environments.