About Us

Ranjit Nair, M.D.

Dr. Ranjit Nair founded The Lung and Sleep Center of North Texas in 2012.  The Fort Worth native returned to his roots, after years of extensive training and experience, to establish a practice where he can devote the extra time required to develop a relationship with his patients and create a highly personalized and specific care plan based on their individual needs.

In 2013, Dr. Nair became one of the first physicians in the Dallas-Fort Worth area to enter in the cutting edge field of interventional pulmonary medicine, a minimally-invasive method of diagnosing and treating lung disorders.  Through the use of advanced techniques such as endobronchial ultrasound, patients are often able to receive a diagnosis without undergoing major surgery.

Dr. Nair pursued his various specialties to focus on the diagnostic challenges of patients with high acuity conditions and to focus on the long term treatment of patients with chronic conditions.  Dr. Nair strongly believes that the doctor-patient relationship is essential to successful medical outcomes.

Dr. Nair comes from a family of physicians.  His mother, father and uncle have practiced medicine in the Dallas-Fort Worth area for the past several decades. Outside of work, Dr. Nair enjoys spending time with his wife, son and daughter. His hobbies include reading, traveling, scuba diving, and supporting his favorite team, the Dallas Cowboys.

Board Certified:
American Board of Internal Medicine, Internal Medicine
American Board of Internal Medicine, Pulmonary Disease
American Board of Internal Medicine, Critical Care Medicine
American Board of Internal Medicine, Sleep Medicine

Fellowship: Pulmonary/Critical Care Fellow, Newark Beth Israel Medical Center, Newark, NJ. 7/2006-6/2009

Residency: Internal Medicine Resident, Newark Beth Israel Medical Center, Newark, NJ. 7/2003-6/2006


Steven Kim, M.D.

Dr. Steven Kim completed his Residency and Fellowship in Pulmonary & Critical Care Medicine at the University of Medicine & Dentistry of New Jersey in 2010. As a native Texan, he moved back to the Dallas Fort-Worth area in 2010 with a passion for treating patients with severe lung disease, with a focus on advanced, minimally invasive bronchoscopic procedures for diagnosing and staging Lung Cancer and other Interstitial Lung Diseases. Dr. Kim strongly believes in a “Team” mentality, working closely with the patient and their other care providers to formulate a comprehensive, cohesive treatment plan for each individual patient.


Jeremiah Simmons, FNP

Jeremiah Simmons graduated from nursing school in 2010. He worked as an RN in Medical City Fort Worth’s medical ICU for 3 years, during which time he obtained his CCRN (critical care registered nurse) certification. He then moved to Cook Children’s Hospital, where he worked as an RN in multiple ICU settings for 5 years. In 2018, he graduated with his Master of Science in Nursing from University of Texas at Arlington and began working as a nurse practitioner. Jeremiah has a passion for pulmonary and critical care medicine and enjoys getting to know his patients in order to provide the most efficient and effective care.

Jeremiah is a native of Texas and US Air Force veteran. He enjoys spending time with his wife, son, and daughter, as well as fishing and running.

Hospital & Professional Affiliations

Medical Staff Appointments:

  • Texas Health Harris Methodist Fort Worth
  • Baylor Scott & White Fort Worth
  • Kindred Hospital Fort Worth
  • Medical City Fort Worth
  • Medical City Alliance
  • Medical City North Hills
  • Methodist Southlake Hospital

Professional Memberships:

  • American College of Chest Physicians
  • American Thoracic Society
  • American Association of Sleep Medicine
  • Texas Medical Association
  • Tarrant County Medical Society