About
Dr. Guillermo Marrero earned his Doctorate of Medicine from the American University of the Caribbean in Montserrat, British West Indies, in 1993. He completed both his internship and internal medicine residency at Memorial Hospital of Rhode Island in Pawtucket. His residency training ran from 1994 through 1997.
Dr. Marrero has practiced medicine for over two decades, building his reputation in the greater Orlando area. He holds a Florida medical license and maintains hospital affiliations with Orlando South Seminole Hospital and Orlando South Seminole Hospital - Longwood. He specializes in internal medicine and preventive medicine, with a strong focus on early risk identification. He believes that trust, collaboration, and communication form the core of genuine patient care. His treatment plans reflect each patient's individual preferences and circumstances. Dr. Marrero is fluent in English and Spanish. Outside of medicine, he enjoys skiing, hiking, travel, pickleball, and fishing.
Education & Training
Medical School
American University of the Caribbean, Montserrat, British West Indies - Doctorate of Medicine 1993
Residency
Internal Medicine, Memorial Hospital of Rhode Island, Pawtucket, RI (1995-1997)
Additional Training
Internship, Memorial Hospital of Rhode Island, Pawtucket, RI (1994-1995)
Languages
English, Spanish
Who is Dr. Marrero right for?
Dr. Marrero is a strong fit for adults who want a physician focused on prevention and early risk reduction. Patients managing chronic conditions or seeking thorough annual screenings benefit from his diagnostic depth. Spanish-speaking patients appreciate his full fluency in both English and Spanish. Those who value a long-term, relationship-driven approach to primary care tend to stay with Dr. Marrero for years.
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Frequently Asked Questions
Dr. Marrero specializes in internal medicine and preventive medicine. His primary focus is helping patients identify and reduce health risks before they become serious conditions. He pairs this focus with comprehensive screenings and advanced diagnostic testing.
Dr. Marrero has practiced medicine for over two decades. He has served patients from the greater Orlando area for nearly 25 years, building long-term relationships with many of his members.
Dr. Marrero earned his Doctorate of Medicine from the American University of the Caribbean in 1993. He completed his internship and internal medicine residency at Memorial Hospital of Rhode Island in Pawtucket, finishing in 1997.
Yes, Dr. Marrero is fully fluent in both English and Spanish. He regularly sees patients who prefer to communicate in Spanish and tailors his care accordingly.
Dr. Marrero builds every patient relationship on trust, collaboration, and open communication. He designs treatment plans around each patient's individual preferences and circumstances. His goal is to provide care that patients experience as personal and responsive, not generic.
Yes, Dr. Marrero is reachable by phone after hours and on weekends. Members can contact him directly for urgent concerns outside of regular office hours.
Dr. Marrero holds affiliations with Orlando South Seminole Hospital and Orlando South Seminole Hospital - Longwood. These affiliations support patients who need hospital-level care in the area.
Yes, Dr. Marrero offers same- and next-day appointments for his members. His smaller practice size allows him to accommodate urgent needs quickly without long waits.
Doctor profile last updated June 6, 2026