About Our Practice
Georgetown Pulmonary Associates, P.A. (GPA) was founded in 2009 on the premise of providing accessible, comprehensive pulmonary and critical care coverage to meet the growing health care demands in the Central Texas community. Our scope of practice includes the subspecialty of Interventional Pulmonology.
Dr. Esther Fields, Dr. Dominic deKeratry, and Dr. Audrey Nguyen are all board certified Pulmonary and Critical Care specialists. Dr. Fields and Dr. deKeratry both have extensive experience in the performance of a wide-range of interventional pulmonology and pleural procedures.
For diagnosing and treating a variety of respiratory diseases (see Conditions We Treat), we offer an in-office, full service pulmonary function lab. This enables us to perform comprehensive diagnostic testing for patients with respiratory ailments.
In our office, while the patient is receiving procedural sedation and analgesia, we are able to perform diagnostic bronchoscopies and endobronchial ultrasound (EBUS). EBUS, commonly referred to as “medical mediastinoscopy”, allows us to sample lymph nodes in the chest with a minimally invasive technique. We are also able to perform chest ultrasound to evaluate pleural diseases (e.g. pleurisy, pleural effusions). The ultrasound provides a component of safety in draining pleural fluid by thoracentesis or during placement of a long-term tunneled pleural catheter (Pleur-X).
Our experienced, friendly and accommodating office staff includes registered nurses and medical assistants, as well as insurance and administrative coordinators. Learn more about our practice below or by calling us.
Dr. Dominic deKeratry
Born in Tulsa, Oklahoma and raised on the East Coast as part of a U.S. Navy family before settling in Amarillo, TX. He attended undergraduate school at Texas A&M University (TAMU) in College Station and medical school at the University of Texas Medical Branch at Galveston.
He served in the U.S. Navy as a physician from 1993 to 2000 where he completed his internship and residency at Bethesda Naval Hospital. He served as a senior medical officer while being stationed aboard the USS Kearsarge out of Norfolk, VA for two years and earned his Surface Warfare Medical Department Officer qualification. During his last two years of service, he worked at the Uniformed Services University of Health Sciences in the department of tropical medicine in Bethesda.
He completed his fellowship training in Pulmonary & Critical Care Medicine at Scott & White Memorial Hospital and TAMU Health Science Center in Temple with a special focus in the field of Interventional Pulmonology. He attended a sabbatical in Brussels, Belgium and Hemer, Germany developing expertise in therapeutic bronchoscopy as well as medical thoracoscopy. He is board certified in Pulmonology and Critical Care medicine and has presented work in the field of Interventional Pulmonology at International Meetings. After practicing in Temple for six years as a critical care physician and the director of interventional pulmonology, he moved to Georgetown and co-founded Georgetown Pulmonary Associates, P.A. He also serves as an assistant professor to the Texas A&M Medical School in Round Rock, Texas.
Dr. Esther Fields
Born and raised in New Jersey, Dr. Fields attended Ursinus College in Pennsylvania for her Bachelor’s in Science, then medical school at Philadelphia College of Osteopathic Medicine (PCOM). She continued her training at St. Luke’s Hospital in Bethlehem, Pennsylvania where she completed her residency in internal medicine.
She moved to Texas in 2005 where she completed her fellowship in pulmonary & critical care medicine with special training in the field of interventional pulmonology at Scott & White Memorial Hospital and Texas A&M University Health Sciences Center. Her training included training with Dr. Dominic deKeratry, working with international experts in Brussels, Belgium and also the Cleveland Clinic in Ohio. After practicing Interventional Pulmonology & Critical Care for a year in Temple, TX, she co-founded Georgetown Pulmonary Associates, P.A in 2009. She is board certified in Internal Medicine, Pulmonology & Critical Care. She also serves as an assistant professor for the Texas A&M Medical School in Round Rock, Texas.
Her work interests include intensive care medicine, mycobacterial lung disease, lung cancer, airway disease and interventional pulmonology. Her personal interests include raising her 2 young boys, traveling and running.
Dr. Audrey Nguyen
Dr. Audrey Nguyen was born and raised in Austin, TX. She attended the University of Texas at Austin for her undergraduate education and graduated with a dual degree in 2002. She spent the next several years at the University of Texas Medical Branch at Galveston, where she obtained her Doctor of Medicine degree and completed her Internal Medicine residency. From there, she attended the University of Texas Health Science Center at Houston for her pulmonary and critical care fellowship, and finished her training in 2012.
Dr. Nguyen returned to the Central Texas area with her family in 2016. She previously served the Beaumont, TX, area in private practice for many years, focusing on Critical Care medicine, hospitalist medicine, and Pulmonology. She is board certified in Internal Medicine, Pulmonary Disease, and Critical Care Medicine.
Dr. Ghassan "Gus" Koussa
Dr. Koussa was born and raised in Lebanon. He received a Bachelor of Science degree in Chemistry from The American University of Beirut. He went on to receive his Doctor of Medicine degree from St. George’s University in Grenada. He completed his Internal Medicine Residency and Pulmonary & Critical Care Fellowship at Albany Medical College in Albany, NY. Dr. Koussa is board certified in both Pulmonary Disease and Critical Care Medicine. He has extensive training in Critical Care Ultrasonography, Endobronchial Ultrasound Bronchoscopy, and Pleur-X Catheter placement. Dr. Koussa served both hospital and private practice patients in New Hampshire and New York for over a decade.
Dr. Koussa, his wife and three kids moved to Texas in the summer of 2022. He is eager to serve the Georgetown community. He is multilingual – fluent in English, Arabic, and French.
Katie Wentworth, PA-C
PA Katie Wentworth was born and raised in El Paso, TX. She attended the University of Texas at Dallas for her Bachelor of Science in Biology and began working in the medical laboratory field. She moved to Austin, TX to work for the Texas Department of State Health Services before beginning her training as a physician assistant. She graduated from the University of Texas Health Science Center at San Antonio with her Master of Physician Assistant Studies and moved back to Austin, TX to begin working.
She is very excited to be caring for the Georgetown and surrounding communities and looks forward to working alongside her patients to improve their health. In her spare time, PA Katie enjoys reading, dancing, traveling, skiing and spending time with her German Shepherd, Theo.
Bethany serves our patient community as Office Manager. She joined our practice family in 2012 after moving from Fort Worth to the Central Texas area. She has a passion for helping others, which is why she chose the medical field. Outside of the office, Bethany loves spending time outdoors with her husband and son. She is a Texas native, a die-hard Dallas Cowboys fan, and a lover of all things music.