235 Citrus Tower Blvd.
Clermont, FL. 34711
Phone: (863) 419-0104
40124 US Hwy 27, Suite 202
Davenport, FL 33837
Phone: (863) 419-0104
1121 North Central Ave, Suite B.
Kissimmee, Fl. 34741
Phone: (407) 933-1221

Our Physicians

Thomas O’Brien, MD
Dr. O'Brien has been a pulmonologist serving in Central Florida for more than 20 years with more than 25 years of experience. He currently serves as President of Pulmonary Disease Specialists, PA and is the Principal Investigator of PDS Research Center. He has served as Medical Director of Respiratory Services, Chairman of the Medical Staff and Chief of Medicine at several hospitals in Central Florida. He is a member of the American College of Chest Physicians, the American Society of Internal Medicine, and the American College of Physicians, the Florida Medical Association, and the Osceola County Medical Society.

Adam Griggs, DO, FCCP, FAASM
Dr. Griggs has been evaluating and treating patients with sleep disorders in Central Florida for more than 20 years. He is currently as the Vice President of Pulmonary Disease Specialists, PA and serves as the Co-director of Central Florida Sleep Centers. Dr. Griggs is Board Certified in Pulmonary Diseases, Internal Medicine and Sleep Medicine. He has been a member of the following Medical Societies: Fellow of the American College of Chest Physicians, Member of the American Thoracic Society, Fellow of the American Academy of Sleep Medicine, Member of the American Osteopathic Association.

Rhoderick Nazario, MD, FCCP
Dr. Nazario has been with the practice since 2002. He is board certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine. He has served as the Director of ICU, Chairman of Performance Improvement Core Measure Committee, a member of the credentials committee, and Director of Respiratory Care Services at several hospitals in Central Florida. Dr. Nazario is a member of the American College of Chest Physicians.

Other languages spoken: Filipino

James Lucio, MD, FCCP, DAASM
Dr. Lucio has been with our practice since 2003 and offers more than 20 years of experience. He has been serving as the Medical Director for Central Florida Sleep Centers for 10 years. Dr. Lucio is board certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine. He is a member of the following Medical Societies: Fellow of the American College of Chest Physicians, the Florida Medical Association, the Florida Thoracic Society, the American Thoracic Society, and the American Academy of Sleep Medicine. Dr. Lucio has serves as Secretary of the Medical Staff and Director of ICU at some of the hospitals in Central Florida.

Other languages spoken: Spanish

Joseph Ameh, MD, DAASM
Dr. Ameh has been with our practice since 2006 and offers more than 10 years of experience. He has been a member of the following medical societies: the American College of Chest Physicians, the American Thoracic Society, and the Society of Critical Care Medicine. Dr. Ameh is board certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine. He received his internal medicine training from the Mount Sinai School of Medicine program in New York and then completed a pulmonary, critical care and sleep medicine fellowship at UMDNJ in New Jersey. He is the medical director of the Intensive care unit (ICU) at Florida Hospital, Kissimmee.

Other languages spoken: French

Jose Urdaneta-Jaimes, MD, FCCP, DAASM
Dr. Urdaneta has been with our practice since 2007 and offers more than 10 years of experience. He has served as Principal Investigator and Medical Research Director for PDS Research. He has been a member of the following medical societies: the American Academy of Sleep Medicine, the Society of Critical Care Medicine, the American College of Chest Physicians, the American Thoracic Society, the American College of Physicians, and the American Medical Association. Dr. Urdaneta is board certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine.

Other languages spoken: Spanish

Naeem Z Ahmed, MD, FCCP
Dr. Ahmed has been with our practice since 2011. He relocated from Omaha, Nebraska where he served as the Clinical Assistant Professor at Creighton University and as the Director of Critical Care and Cardiopulmonary Department of a facility in Fremont, NE. Currently, Dr. Ahmed is a Clinical Assistant Professor at University of Central Florida. He is a member of the following medical societies: the American Thoracic Society, the American Academy of Sleep Medicine, Society of Critical Care Medicine, and the American College of Chest Physicians. He is board certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine.

Other languages spoken: Urdu, Punjabi, and Hindi.

Ali Ashraf, MD
Dr. Ashraf joined our practice in 2012. He joins our group after completing his post graduate training. Dr. Ashraf completed his post graduate training at St. Elizabeth’s Medical Center, Tufts University, in Boston MA.

Susan A. Metcalf, ARNP-BC
Susan Metcalf has been with our practice for more than 10 years and offers more than 20 years of experience. Susan has worked as a trauma nurse for as well as an ICU nurse for several years prior to working in a private practice setting. She is board certified in Adult Health by the American Nurses Credentialing Center and is Critical Care certified by the American Association of Critical Care Nurses. She has been a member of the following medical societies: American College of Chest Physicians, Space Coast Clinicians Group, New York State Coalition of Nurse Practitioners, Richmond County Nurses Association, Society of Gastroenterology Nurses and Assistants, American Society of Forensic Nurses, American Association of Critical Care Nurses, New York State Nurses Association, and the American Nurses Association.

Teresa D. Timmons, ARNP-BC
Teresa Timmons has been with our practice since 2012. She has worked as an ICU nurse in both Medical and Surgical Intensive Care Units prior to joining our group in a private practice setting. Teresa is board certified as a Family Nurse Practitioner by the American Nurses Credentialing Center.