Meet Sam Mascareno, RSM US LLP COO — Bio + How to Reach Out

Last updated: 2025-11-17

Who is Sam Mascareno?

Sam Mascareno is the Chief Operating Officer at RSM US LLP, responsible for leading enterprise operations across multiple regions including the U.S., Canada, India, and El Salvador. He has been with RSM since 2001 and previously served as the enterprise markets leader and West region leader. Sam has a background as a tax professional and is known for his pragmatic, data-driven approach to business. He is committed to inspiring teams and delivering results aligned with RSM’s purpose.

Sam Mascareno's Work History

Sam Mascareno has extensive experience in leading large-scale projects and delivering tax consulting for global clients. He has held various leadership roles at RSM, focusing on growth, client experience, and market strategy. His career began as a tax professional at a Big Four firm in 1994, and he has been with RSM since 2001.

• 2017 - Chief Operating Officer, RSM US LLP
• 2007 - Tax Partner, RSM US LLP
• 2023-2025 - 2025 - Enterprise Markets Leader, RSM US LLP
• 2016 - 2023 - West Market Leader, RSM US LLP
• 1994 - 2001 - Tax Manager, PricewaterhouseCoopers

Sam Mascareno's Education

Sam earned a Bachelor of Science in Accounting and a Master of Science in Accountancy (Tax) from San Diego State University-California State University.

• San Diego State University-California State University - Bachelor of Science (B.S.) in Accounting (1989 - 1992)
• San Diego State University-California State University - Master of Science (M.S.) in Accountancy (Tax) (1992 - 1993)

How to Reach Sam Mascareno?

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