Meet Our Physicians

Alan L. Keller, MD, FACS

Specialty: General and Vascular Surgery

Dr. Keller is a graduate of Northwestern Medical School, and is a Board Certified General Surgeon.

He completed a vascular fellowship in New York and is a Fellow of the American College of Surgeons.

Dr. Keller has provided care to patients in Central Florida for over twenty years. He is committed to delivering exceptional care in all aspects of his practice and dedicated to using the most up-to-date techniques in total vein care.

Lucrecia T. Sta. Ana, M.D

Specialty: Colorectal Surgery

Dr. Sta. Ana graduated from the University of Texas Health Science Center at San Antonio and is a Board Certified Colon and Rectal Surgeon. She performed her Internship and Residency at St. Elizabeth's Medical Center, Boston, MA, which was followed by a Colorectal Surgery Fellowship at the Colon and Rectal Clinic of Orlando in Orlando, Florida. She has had multiple papers published and is regularly invited to present at medical conferences across the nation. She is a member of the American College of Surgeons, American Medical Women's Association, American Society of Colon and Rectal Surgeons and many other organizations.

When she is not in the office you can find her outdoors. She plays tennis and is getting bit by the golf bug. Travel is also a passion for her and her husband.

Napoleon Estrada, MD

Specialty: General Surgery

Dr. Estrada is a graduate of Far Eastern University in the Philippines and is a Board Certified General Surgeon. He completed his residency in New York, NY at NY Infirm Beekman.

Dr. Estada has provided care to patients in central Florida for over 25 years. He is committed to delivering quality care in all aspects of his practice and is dedicated to offering the most up-to-date techniques, especially minimally invasive surgeries, to his patients.

Prior to joining the team at Osceola Surgical Associates, Dr. Estrada was part of Surgical Management , Ltd., a Kissimmee-based general surgery practice.

Fuad Shahin, MD

Specialty: General Surgery

Dr. Shahin is a graduate of the University of Aleppo, Faculty of Medicine in Syria and is Board Certified in General Surgery. He completed his residency at New York Methodist Hospital – Cornell Medical Center.

Dr. Shahin has provided care to patients in central Florida for over 15 years. He has committed himself to deliver high-quality care to his patients. His use of minimally invasive surgeries continues to provide patients with the most up-to-date techniques available.

Prior to joining the team at Osceola Surgical Associates, Dr. Shahin was part of Surgical Management , Ltd., a Kissimmee-based general surgery practice.

Antonio Ramirez, DO

Specialty: General Surgery

Dr. Ramirez is a graduate of Southeast University Medical College and is Board Certified in General Surgery. He completed his residency at Florida Hospital East Orlando.

Dr. Ramirez is committed to delivering quality care in all aspects of his practice. He is dedicated to offering the most up-to-date techniques and procedures, especially those that involve minimally invasive surgeries. Dr. Ramirez has over 15 years of providing care to patients in central Florida.

Prior to joining the team at Osceola Surgical Associates, Dr. Ramirez was part of Surgical Management , Ltd., a Kissimmee-based general surgery practice.