Mario A. de Castro

How Mario Helps Clients

Mario advises globally active enterprises and closely held family businesses (and their shareholders) on tax and related international business and Federal Regulatory matters. His experience includes inbound and outbound international tax planning and structuring, pre- acquisition (M&A) planning, supply chain planning, and advising on tax and corporate regulatory (AML and CFIUS) matters. 

His industry experience spans private equity, real estate, technology and telecommunications, Fintech, bio-life, crypto-currency issuers, hospitality, defense and service companies. Mario is a frequent speaker on cross-border business and transactional matters. 

What Clients Can Expect

Mario’s approach to client service is based on building deep personal relationships with clients and their stakeholders, and approaching their matters with an intentional and deliberate objective to serve and accomplish a client’s particular domestic or cross-border business goals in collaborative, thoughtful, timely, and efficient manner, without sacrificing attention to detail. For Mario the end goal with each client interaction is to bring enthusiasm and thoughtful energy to each interaction to enable him to become a trusted advisor and partner to each client.  

Outside the Office

Inside and outside of the office, Mario strives to be friend and mentor to others, and is a husband and father to six children. He enjoys watching his daughters on the field hockey pitch and his sons on the baseball diamond, and attending his music-teacher wife’s musical choral performances.