All our providers maintain the highest levels of accreditation and pursue ongoing education to stay abreast of the latest trends in the medical field. Read on to learn more about our provider's experience and training.

Ian Martínez, M.D., completed his internal medicine residency and gastroenterology fellowship at Louisiana State University Health Sciences Center in New Orleans, Louisiana. After his internship in 2008, he was awarded the LSU School of Medicine Aesculapian Society Intern of the Year Award. He was chosen for his approachability, enthusiasm, and superior quality of instruction. Dr. Martinez has been practicing Gastroenterology since 2010 and is certified by the American Board of Internal Medicine. He is a member of the American College of Gastroenterology and the Florida Gastroenterologic Society. Dr. Martinez joined Gastroenterology Services in July 2017 and lives in Oviedo with his wife and three children. He is also fluent in Spanish.

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Dr. Gabriel Silva completed his Internal Medicine residency at HCA Florida Kendall Regional Medical Center and his Gastroenterology fellowship at HCA Florida Aventura Hospital. He is a member of the American College of Gastroenterology (ACG), the American Society for Gastrointestinal Endoscopy (ASGE), and the American Gastroenterological Association (AGA). 

Fluent in Spanish and Portuguese, Dr. Silva draws from his Brazilian and Colombian heritage to connect with a diverse patient community. Outside of medicine, he enjoys sports such as soccer, pickleball, and ultimate frisbee, as well as grilling picanha and exploring healthy, delicious foods. He is married with four young children and is excited to raise his family in the area. 

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Dr. Jessica Narváez-Lugo is a board-certified gastroenterologist who earned her M.D. from Ponce Health Sciences University. She completed her Internal Medicine residency at the VA Caribbean Healthcare System and her Gastroenterology Fellowship at the University of Puerto Rico. Dr. Narváez-Lugo is certified in Gastroenterology and Internal Medicine and is an active member of the American Society for Gastrointestinal Endoscopy (ASGE) and the American College of Physicians (ACP). Fluent in both English and Spanish, Dr. Narváez-Lugo values patient education and clear communication. Outside of her practice, she enjoys spending time with her family, staying active, and keeping up to date with the latest medical advancements.

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Lauren Knuelle completed her Associate of Science in Nursing degree in 2012 from Valencia College and her Bachelor of Science in Nursing degree in 2014 from the University of South Florida. She continued to receive her Master of Science in Nursing in 2021 from Chamberlain University, where she graduated with honors distinction. She is a Family Nurse Practitioner and is certified by the American Academy of Nurse Practitioners. She worked at South Seminole Hospital on the progressive care unit for 4 years, caring for critically ill patients, and at Winnie Palmer Hospital for 6 years, caring for patients with a variety of high-risk obstetrical complications. Lauren joined Gastroenterology Services in January 2022 and currently resides in Oviedo with her husband and 3 children.

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