Associate Attorney

Sergio A. Castillo joined Monty & Ramirez LLP in 2025, bringing a strategic, deal-focused legal skill set to the firm’s Houston office. He is admitted to practice in Texas and eligible to appear in any jurisdiction recognizing the Uniform Bar Examination (UBE).

He earned his Juris Doctor from South Texas College of Law Houston, where he also secured a Transactional Law Practice Certificate, providing deep experience in structuring sophisticated commercial and real estate transactions. Sergio holds a Master’s in Theological Studies from the Pontifical John Paul II Institute at the Catholic University of America (DC), and a B.A. in Psychology from the University of St. Thomas in Houston.

As an attorney, Sergio has negotiated and supported multiple multi-million-dollar real estate and commercial transactions, demonstrating his adeptness in deal execution, and contract negotiation. These accomplishments reflect the firm’s own results-driven and cost-effective approach to advocacy.

He is also a Senior Fellow of the Gulf Coast Chapter of the American Leadership Forum, underscoring his dedication to leadership and civic engagement.

At Monty & Ramirez LLP, Sergio’s transactional acumen strengthens the firm’s core capabilities. Sergio will contribute to the firm’s entrepreneurial and innovative culture. His multidisciplinary background positions him well to support clients across a range of matters, particularly those involving transactional, and organizational issues—leveraging his background and proven record in high-value negotiations.

Practice Areas

• Real Estate Law
• Estate Planning
• Business Law

Admitted to Practice

• Texas

Professional Activities & Awards

• Senior Fellow, American Leadership Forum, Gulf Coast Chapter

Education

• South Texas College of Law, J.D., 2021
• Catholic University of America. M.A., 2006
• University of St. Thomas, B.A., 2003

Languages

• English
• Spanish