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Rueben Guillen, CPA

Audit Associate

Professional Experience

Rueben began his accounting career at Gainer, Donnelly & Desroches, LLP (now CRI) in Houston, TX after graduating from the University of Houston – Clear Lake. Rueben performed audits and other assurance services for privately held companies operating in various industries. Subsequently, he joined the corporate accounting team of Oil States International, Inc. – a publicly traded, oilfield services company. With valuable experience gained from both his public and industry roles, he looks forward to providing excellent service and serving as a trusted resource to clients.

Rueben joined Maxwell Locke & Ritter in 2017 and enjoys working for a reputable firm that values its people and clients.

Industry Focus

  • Manufacturing
  • Nonprofit
  • Oil & Gas


  • University of Houston, Clear Lake - Bachelor of Science in Accounting
  • University of Houston, Clear Lake - Master of Science in Accountancy


  • American Institute of Certified Public Accountants
  • Texas Society of Certified Public Accountants