skip to Main Content
Guillen Pujol CPAs

After decades of developing and shaping his career with global accounting firms representing Fortune 500 companies, Nestor Guillen founded Guillen Pujol CPAs to help his clients meet the ever-changing International Tax regulations to expand their businesses into the U.S. and beyond. Since its creation in 2009, Guillen Pujol CPAs, formally known as Globalbiz Tax and Business Consulting, has helped companies around the globe address their monetary challenges and achieve their financial goals with tax planning and accounting strategies.

A full-service accounting firm specializing in international tax and business consulting, GPCPAs was conceived to deliver the same services that Fortune 500 companies receive from the Big Four firms. 

Our focus is to put these services within reach of all-size businesses and federal, state, and local government agencies. To meet our premise, we have assembled an elite team of partners, professional advisors, and foreign correspondents from large firms that assist companies in the Fortune 500 environment.

We have streamlined processes, identifying and eliminating the most costly and unnecessary infrastructures to optimize investments and help your business grow in size, scope, and revenue at a fraction of the cost associated with traditional firms.

We are members of the American Institute of Certified Public Accountants (AICPA), the Florida Institute of Certified Public Accountants (FICPA), and the Global Professional Network XLNC, an international association of independent accounting, law, and management consulting practices from across the globe.

Through a multidisciplinary approach, XLNC firm members, like GPCPAs, offer a global forum to develop mutually beneficial relationships among peers. Through XLNC, GPCPAs support our members’ development, aiding smooth and consolidated growth, facilitating networking opportunities to exchange views, ideas, and know-how, as well as the ability to benchmark and share business and experiences. 


Nestor Guillen is an internationally recognized financial expert with 40 years of extensive experience in the fields of accounting advisory, tax planning, tax consulting, mergers and acquisitions, tax and financial due diligence, and cross-border transactions for individuals, and corporations, in the U.S., Europe, Latin America, and the Caribbean.

Nestor Guillen is the founder and CEO of Guillen Pujol CPAs, formally known as Globalbiz Tax & Business Consulting. He was the Founder and Managing Partner of Grant Thornton Venezuela until he arrived in the South Florida region to serve as the Executive Director of Grant Thornton LLP’s Latin America Tax Gateway and as a member of Grant Thornton International’s Latin American Executive Committee.

Additionally, Guillen has served on numerous boards, including the British American Chamber of Commerce of Florida, the International Committee of the Greater Miami Chamber of Commerce, and several bi-national Chambers of Commerce in South Florida. Guillen is a member of the American Institute of Certified Public Accountants (AICPA) and the Florida Institute of Certified Public Accountants (FICPA).

Nestor Guillen is licensed as a CPA in Florida and Venezuela.

Early Years

Born and raised in Venezuela and growing up in a family of accountants, Guillen followed his father’s steps and pursued a career in numbers. He graduated as a Certified Public Accountant from the Universidad del Zulia in Maracaibo, Venezuela. Later, at the early age of 25, he joined Espiñeira, Sheldon & Asociados, PricewaterhouseCoopersPrice Venezuela. Eventually, Guillen created his own firm, which later converted into Grant Thornton, Venezuela. Simultaneously, Guillen earned a specialization in International Business from the Universidad Metropolitana in Caracas, where he graduated Magna cum laude. Consequently, after moving to the U.S., he earned an MBA from the Keller Graduate School of Business at Devry University in the United States and graduated with honors.


In his leisure time, Guillen enjoys spending time with his family, as well as participating in weekly training sessions with his Outrigger Canoe team, Kana Lui, in Miami, Florida.