Master Enterprises a.k.a. The Traveling Bookkeeper was founded by Irene Kotsakis Nistazos in 1996, driven by a mission to bring clarity, confidence, and continuity to business finances. What began as a solo venture in New York has expanded into a trusted bookkeeping firm serving clients across multiple states. Our expansion has been largely driven by strong CPA and client referral networks while our work has always been characterized by transparent and unmatched services, fully performed in-house. We specialize in full-spectrum bookkeeping—from catch-up and clean-up projects to controller and advisory services. Whether you’re behind on reconciliations or planning your next growth leap, we’re built to meet you where you are—literally and financially.

Our team combines decades of experience across industries with a personal, human-first approach. We’re proud to be advisors, problem-solvers, and advocates for your financial clarity.

With years of hands-on experience and a passion for helping businesses thrive, we bring clarity, confidence, and consistency to every project. Our team is built on a foundation of integrity and insight—delivering solutions that are not only effective but tailored to your unique goals. We don’t just offer services; we offer trusted partnerships that grow with you.

Irene is the founder of Master Enterprises NY and Florida, providing expert bookkeeping and QuickBooks training since 1996. A certified QuickBooks ProAdvisor, she leads a team that specializes in full-service bookkeeping, reconciliations, payroll, budgeting, and more. Irene’s dedication to empowering business owners has earned her national recognition, including Woman of the Year honors and lifetime membership in Strathmore’s Who’s Who.

Irene Kotsakis Nistazos, Founder & CEO

Chelsea joined Master Enterprises Florida in 2023, transitioning from hospitality to finance with enthusiasm. She enjoys the strategic side of bookkeeping and the unique dynamics each client brings. Educated in business management and pastry arts, she relocated to Florida for a fresh start. Now she balances her love for the beach, basketball, and her growing pack of pups with her role on the team.

Chelsea Machado, Bookkeeping Associate

With over 20 years of experience, Mariana brings deep expertise in bookkeeping, clean-up projects, and financial accuracy across industries. She’s passionate about tech-driven solutions and delivering high-quality work that meets client needs. After years of remote work, she rejoined an office setting with Master Enterprises Florida in 2024, where she thrives on collaboration and building strong relationships.

Mariana Acevedo, Senior Bookkeeper