Meet Our Leadership Team

Michel Millien serves as the Director of Tax Controversy Services at ABGi USA, where he leads IRS engagement strategy and represents clients in complex federal and state examinations. With more than 12 years of specialized experience in tax controversy—with a focus on the Research and Development Tax Credit (RTC)—Michel is a trusted advocate who ensures clients’ positions are effectively defended and the law is applied accurately throughout the audit process.

Michel has successfully represented hundreds of taxpayers across a broad range of industries, guiding them through examinations and resolutions with efficiency and precision. He works closely with ABGi’s technical R&D tax team to apply evolving case law, regulatory updates, and strategic documentation practices that maximize credit sustainability and audit outcomes.

Known for his collaborative, client-centered approach, Michel fosters strong partnerships with internal teams and external stakeholders alike.  
Michel holds a Bachelor’s degree in Political Science and Criminal Justice from Seton Hall University and earned his Juris Doctor from South Texas College of Law.