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.

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

Fellowship: Pulmonary/Critical Care Fellow, Rutgers University, Newark, NJ. 7/2013-6/2016.

Residency: Internal Medicine Resident, University of Medicine and Dentistry of New Jersey, Newark, NJ. 7/2010-6/2013

 

Joe Devasahayam, MD

Dr. Devasahayam is a graduate of the prestigious Stanley Medical College in Madras, India. He moved to the United Kingdom in 2003 where he practiced as an emergency medicine and internal medicine physician. Dr. Devasahayam continued his medical training in pulmonary and critical care medicine at St. Mary’s Health Center & the University of Missouri. He worked in Sioux Falls, SD for several years as a pulmonologist and intensivist prior to moving to Texas. Dr. Devasahayam has a special interest in interventional bronchoscopic procedures for lung cancer diagnosis and staging.
Board Certified:
American Board of Internal Medicine, Internal Medicine
American Board of Internal Medicine, Pulmonary Disease
American Board of Internal Medicine, Critical Care Medicine
Fellowship: Pulmonary/Critical Care Fellow, University of Missouri, Columbia, MO. 10/2014-10/2017.

Residency: Internal Medicine Resident, St. Mary’s Health Center, St. Louis, MO. 7/2008-6/2011.

Jeremiah Simmons, MSN, FNP, AGACNP

Dr. Jeremiah Simmons

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.

 

Edward Vasquez, MSN, AGACNP, APRN

Dr. Edward Vasquez

Edward Vasquez began his nursing career in the adult intensive care unit in 2009. He was born and raised in South Texas and relocated with his family to the DFW area in 2012 to expand his experience and to continue his education and training. Edward worked in the Cardiac ICU at Medical City North Hills while completing his Bachelor’s of Science in Nursing in 2012 and his Master’s of Science in Nursing with a focus in adult acute care in 2021 from the University of Texas at Arlington. Edward believes in educating his patients and developing a comfortable environment for all those in his care.

In his free time, he likes adventuring with his family, visiting new places, and enjoying live music.

 

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