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Muhammad Raza, MD, is a board-certified internal medicine, pulmonology, and critical care medicine physician. He completed his undergraduate education and internal medicine and general surgery internship at Allam Iqbal Medical College in Lahore, Pakistan. He then fulfilled an internal medicine residency at the Sharif Hospital in Lahore before moving to New York City to complete an observership in internal medicine at the Mount Sinai School of Medicine. He relocated to Phoenix to complete an internal medicine residency at Maricopa Medical Center, where he became board-certified in internal medicine. He continued his education as the internal medicine attending doctor in the cardiology department at Maricopa Medical Center. He also completed a fellowship in pulmonary medicine and critical care that led to board certification in pulmonary medicine. In addition to his extensive education, Dr. Raza authored several research papers and publications for the American College of Physicians.

Please note that Maniya Health Medical Group does not employ or in any way supervise Dr. Marc Seelagy. He is employed by Virtua Medical Group, which subleases space from Maniya Health Medical Group. Patients should contact Virtua Medical Group's offices directly for all questions concerning their Pulmonology & Sleep Medicine treatment.

Marc Seelagy, MD is a Board-Certified Pulmonologist & Sleep Medicine Physician at Maniya Health located in Hamilton, New Jersey. Dr. Seelagy is a graduate of the University of Chicago-Pritzker School of Medicine, and has completed a fellowship in pulmonary, critical care, and sleep disorders medicine. Dr. Seelagy has lectured on topics such as sleep apnea, asthma, and pneumonia, and has contributed to articles and clinical trials published in numerous publications.

Dr. Seelagy is noted for his professionalism, knowledge, and caring demeanor, with many highlighting his ability to listen and make them feel comfortable. Long-term patients express their confidence in his expertise and satisfaction with the treatment they receive, often recommending him to others in need of pulmonary care. Dr. Seelagy’s personal interests include scuba diving, skiing, golfing, time at the beach, and playing with his grandchildren. Dr. Seelagy is on staff at Virtua Health.

Navneet Kaur, MD, is a rheumatologist at Touro University Medical Group, a medical group with three locations in Stockton, California. The practice is affiliated with Touro University California, College of Osteopathic Medicine. 

Dr. Kaur earned her Bachelor of Medicine & Bachelor of Surgery (MBBS) at Government Medical College Amritsar (MAHE) in Amritsar, India. She then relocated to the United States and completed his residency at Jacobi Medical Center/Albert Einstein College of Medicine in New York City. Then she completed her rheumatology fellowship at Montefiore Medical Center/Albert Einstein College of Medicine, also in New York City.

Dr. Kaur treats a variety of conditions at Touro University Medical Group, including rheumatoid arthritis, systemic lupus erythematosus, scleroderma, inflammatory myopathy, vasculitis, polymyalgia rheumatica, ankylosing spondylitis, psoriatic arthritis, gout, and osteoarthritis.

Dr. Kaur is dedicated to providing compassionate and individualized patient care by identifying each patient’s unique needs because no two patients are alike.

As we continue to make advancements in the field of rheumatology, Dr. Kaur’s goal is to better educate my patients about available treatment options so that they feel empowered to make informed medical decisions.

Outside of the office, her interests include traveling, watching movies, and spending time with family and friends.

Dr. Kaur is currently accepting new patients. 

Daniel T. Layish, MD, is a board-certified pulmonologist, critical care physician, and sleep medicine specialist, dedicated to providing advanced care for patients with complex respiratory and sleep-related conditions. he serves patients at Solution Health Specialists, which provides care to patients throughout Florida.

Dr. Layish earned a medical degree from Boston University School of Medicine, completed residency training at Washington University School of Medicine, and pursued fellowship training at Duke University Medical Center. Board-certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine. 

Dr. Layish treats a wide range of pulmonary and sleep conditions, including alpha-1-antitrypsin deficiency, cystic fibrosis, COPD, asthma, pulmonary hypertension, pulmonary fibrosis, interstitial lung disease, sarcoidosis, and respiratory failure. In the field of sleep medicine, Dr. Layish specializes in sleep disorders, obstructive sleep apnea, and obesity hypoventilation syndrome.

Committed to delivering patient-centered care, Dr. Layish focuses on individualized treatment plans that combine the latest evidence-based therapies with compassionate support. Through a multidisciplinary approach, patients benefit from comprehensive management, advanced rehabilitation, and innovative strategies designed to optimize respiratory health and overall quality of life.

Boris Betancourt, MD, is a triple board-certified physician specializing in pulmonary medicine, sleep medicine, and internal medicine. With over two decades of experience in healthcare and a focused practice in pulmonology since 2020, Dr. Betancourt provides compassionate, evidence-based care to patients at Pulmonary Care Clinics in Cooper City, Florida.

Dr. Betancourt earned his Doctor of Medicine degree from the University of Medical Science of Havana “ Faculty of medical science of Matanzas” in Cuba in 2003. He went on to complete 2 years preliminary general surgery residency at Jackson Memorial Hospital/University of Miami, followed by an internal medicine residency at St. John’s Episcopal Hospital in Far Rockaway, New York. He then pursued advanced fellowship training in pulmonary medicine at SUNY Downstate Medical Center in Brooklyn, NY, and completed a sleep medicine fellowship at NYU Langone Hospital—Long Island in 2022.

Fluent in both English and Spanish, Dr. Betancourt is committed to improving respiratory health and sleep quality for diverse patient populations. His clinical interests include asthma, COPD, interstitial lung disease, obstructive sleep apnea, hypersomnolence disorders and insomnia. He stays active in the medical community as a member of the American Thoracic Society (ATS), the American College of Chest Physicians (ACCP), and the American Academy of Sleep Medicine (AASM).

To schedule an appointment with Dr. Betancourt, call the office or request one online today. 

Bertrand de Silva, M.D., F.C.C.P. is a graduate of the St. Thomas Hospital Medical School, University of London, England 1986. He was awarded a Medical Research Council Scholarship as well as Medical Research Council Fellowship and subsequently became a Burroughs Wellcome Research Foundation Scholar. He completed his Internship at Kern Medical Center, Bakersfield and Internal Medicine training at USC County Hospital, Los Angeles and a Pulmonary, Critical Care and Sleep Fellowship at Cedars Sinai Hospital. He is board certified in all these fields.

Dr. Bertrand de Silva is the Medical Director of the Sleep Services at St Judes Fullerton, at Preferred Sleep Solutions in Fullerton. He serves as a national consultant to American Imaging Management, AIM Specialty Health (Anthem Subsidiary) in developing the National Sleep Apnea Treatment and Diagnosis Clinical Guidelines.

Ran D. Anbar, MD, FAAP, is board certified in both pediatric pulmonology and general pediatrics, offering hypnosis and counseling services at Center Point Medicine in La Jolla, California, and Syracuse, New York. Dr. Anbar is also a fellow and approved consultant of the American Society of Clinical Hypnosis.

Dr. Anbar is a leader in clinical hypnosis, and his 20 years of experience have allowed him to successfully treat over 5,000 children. He also served as a professor of pediatrics and medicine and the director of pediatric pulmonology at SUNY Upstate Medical University in Syracuse, New York, for 21 years.

Dr. Anbar also worked as a guest editor and advisory editor for the American Journal of Clinical Hypnosis. His experience has offered him the opportunity to direct and co-direct more than 20 clinic workshops on the subject of pediatric hypnosis. Additionally, he has trained more than a thousand healthcare providers and lectured all over the world.

In addition to his teaching and lecturing experiences, Dr. Anbar has been the principal investigator in 10 published case studies of pediatric hypnosis and involved in research trials of children with cystic fibrosis and other pulmonary disorders. He is a published author of more than 50 articles, abstracts, and book chapters on pediatric functional disorders and pediatric hypnosis.

Graduating from the University of California-San Diego with undergraduate degrees in biology and psychology, Dr. Anbar earned his medical degree from the University of Chicago Pritzker School of Medicine. He completed his pediatric residency and pediatric pulmonary fellowship training at the Massachusetts General Hospital and Harvard Medical School in Boston. Dr. Anbar received training in hypnosis from the Society of Developmental and Behavioral Pediatrics and the American Society of Clinical Hypnosis.

Tayler Long, MD, is a board-certified pulmonologist at Southwest Pulmonary Associates in Plano, Texas. He is committed to providing excellent pulmonary and critical care medicine to the community. 

Dr. Long earned his Bachelor of Arts in Human Biology from Stanford University in Palo Alto, California, before completing his Doctor of Medicine at the University of California, San Diego School of Medicine. He went on to complete both his residency in Internal Medicine and his fellowship in Pulmonary and Critical Care Medicine at the prestigious UT Southwestern Medical School in Dallas, Texas.

In addition to his clinical training, Dr. Long holds a Master of Science in Healthcare Leadership and Management from UT Dallas, equipping him with the tools to lead effectively in today’s evolving healthcare landscape. His advanced education and years of experience allow him to offer expert care in managing complex lung diseases, respiratory failure, and critical illness.

Dr. Long joined Southwest Pulmonary Associates in 2007. He has served as President of the Medical Staff at Texas Health Plano and currently holds leadership roles on the Medical Executive Committee at Texas Health Frisco. He also serves as the Director of the ICU at Texas Health Frisco, reflecting his commitment to both patient care and institutional excellence. He is has been recognized as one of D Magazine's Best Docs repeatedly, most recently in 2025.

Outside of medicine, Dr. Long is a devoted husband and father. He is married and enjoys spending time with his three beautiful children.

Mark Robertshaw, MD, is a board-certified pulmonologist and critical care medicine specialist proudly serving patients in Plano, Texas. He joined Southwest Pulmonary Associates in 2023, bringing with him a wealth of clinical experience and a compassionate, patient-centered approach to care.

Dr. Robertshaw completed his fellowship in Pulmonary and Critical Care Medicine at UT Southwestern Medical Center in Dallas, Texas, where he was honored to serve as Chief Fellow during the 2022–2023 academic year. He completed his residency training at Duke University Hospital in Durham, North Carolina, and earned his medical degree from the University of Missouri in Columbia. His academic journey began at the University of Notre Dame in South Bend, Indiana, where he received his Bachelor of Science and developed a lifelong passion for Fighting Irish football.

Board certified by the American Board of Internal Medicine in both Pulmonary Medicine and Critical Care Medicine, Dr. Robertshaw is committed to helping patients manage a wide range of respiratory conditions with leading-edge diagnostic tools and individualized treatment plans. His dedication to community service has been recognized with prestigious honors, including the President’s Volunteer Service Award and the Congressional Award, both received in 2013.

Outside the clinic, Dr. Robertshaw enjoys spending quality time with his wife and daughter, golfing, and cheering on his alma mater during college football season. He looks forward to building long-lasting relationships with his patients and their families throughout the Plano community.

Anthony Ortegon, MD, is a board-certified pulmonologist, critical care specialist, and sleep medicine physician providing expert care to patients in Dallas, Texas. Since joining Southwest Pulmonary Associates in 2013, Dr. Ortegon has been dedicated to helping individuals manage a wide range of respiratory and sleep-related conditions with compassionate, evidence-based care.

Dr. Ortegon earned his Bachelor of Arts in Biology from Swarthmore College in Pennsylvania and went on to receive his Doctor of Medicine from Temple University in Philadelphia. He completed both his residency in Internal Medicine and his fellowship in Pulmonary and Critical Care Medicine at UT Southwestern Medical School in Dallas, one of the nation’s leading academic medical centers.

He is triple board certified by the American Board of Internal Medicine in Internal Medicine, Pulmonary Medicine and Critical Care Medicine. Dr. Ortegon specializes in the diagnosis and treatment of conditions such as asthma, COPD, interstitial lung disease, pulmonary hypertension, and sleep apnea. Dr. Ortegon has a special interest in the diagnosis of various lung pathologies requiring multiple advanced bronchoscopy procedures, including Ion robotic bronchoscopy. Overall, his clinical approach emphasizes clear communication, individualized care plans, and a strong commitment to improving his patients’ overall health and quality of life.

Known for his thoroughness and approachability, Dr. Ortegon values the long-term relationships he builds with his patients. He is proud to be part of the Southwest Pulmonary Associates team and to serve the Dallas community with integrity and expertise.

Kenney Weinmeister, MD is a highly experienced and board-certified pulmonologist, and critical care specialist who has been serving the community of Dallas, Texas, with distinction since 1993 as a member of Southwest Pulmonary Associates. With decades of clinical expertise and a strong academic foundation, Dr. Weinmeister is committed to delivering personalized, comprehensive care for patients with a range of respiratory and sleep-related conditions.

Dr. Weinmeister earned his Bachelor of Science in Pharmacy from Southwestern Oklahoma State University in Weatherford, Oklahoma, and went on to complete his Doctor of Medicine at the University of Oklahoma College of Medicine. He pursued fellowship training in Pulmonary and Critical Care Medicine at UT Southwestern Medical School in Dallas, one of the country’s premier academic institutions. Further enhancing his expertise in healthcare management, he also earned a Master of Business Administration (MBA) from the University of Texas at Dallas.

Dr. Weinmeister has been the recipient of D Magazine's Best Docs recogniztion several times, most recently in 2025. 

He holds board certifications in Pulmonary Medicine, and Critical Care Medicine. His clinical interests include robotics bronchoscopies with early diagnosis and treatment of complex sleep disorders, as well as chronic respiratory illnesses such as asthma, COPD, interstitial lung disease, and respiratory failure.

Dr. Weinmeister is known for his thorough, compassionate approach and his dedication to improving his patients’ long-term health and quality of life. His blend of clinical excellence and leadership continues to make him a trusted resource in pulmonary and sleep medicine across Dallas and beyond.

Munir Hazbun, MD, is a board-certified pulmonologist, critical care specialist, and sleep medicine physician serving patients in Dallas, Texas. He joined Southwest Pulmonary Associates in 2008 and brings a wealth of experience and a patient-centered approach to the diagnosis and treatment of complex respiratory and sleep disorders.

Originally from Santiago, Chile, Dr. Hazbun earned his medical degree from the prestigious Universidad de Chile. He completed his internship at Texas Tech Health Science Center in El Paso and went on to pursue fellowship training at Baylor College of Medicine in Houston, where he specialized in Pulmonary, Critical Care, and Sleep Medicine.

Dr. Hazbun is quadruple board certified by the American Board of Internal Medicine in Pulmonary Medicine, Sleep Medicine, and Internal Medicine. His clinical interests include persistent cough, shortness of breath, lung cancer, sarcoidosis, and complex sleep-related breathing disorders. Known for his thoughtful, comprehensive care, he works closely with each patient to identify the root cause of their symptoms and create personalized treatment plans.

Fluent in both English and Spanish, Dr. Hazbun is committed to serving the diverse needs of the Dallas community. He has been named among D Magazine's Best Doctors and recognized as a Texas Super Doctor from 2010 to 2015 and again in 2025. He has also served as a board member for the local chapter of the American Lung Association.

Outside of medicine, Dr. Hazbun enjoys spending time with his wife, Dr. Pilar Bescos, a family medicine physician, and their two children. His personal interests include biking, pickleball, golf, learning piano, gardening and traveling with his family.

Ross Schumacher, MD, is one of the skilled pulmonologists practicing at the Southwest Pulmonary Associates location in Plano, Texas. He is a versatile and compassionate pulmonary physician who joined Southwest Pulmonary Associates in 2023. His medical journey encompasses intensive care expertise and long-term patient relationships.

Dr. Schumacher completed his undergraduate studies at Indiana University in Bloomington, Indiana. He then went on to complete his Doctor of Medicine at the Indiana University School of Medicine in Indianapolis. He completed his fellowship at the University of Alabama at Birmingham (UAB) and his residency at the University of Texas-Southwestern. He earned the Critical Care Fellow of the Year at UAB in 2022 and the House Officer of Excellence at UT Southwestern in 2019. 

Dr. Schumacher is board-certified in Internal Medicine, Critical Care Medicine, and Pulmonary Medicine by the American Board of Internal Medicine. He has also been a member of CHEST and the American Thoracic Society (ATS) since 2020. Additionally, Dr. Schumacher is an advanced bronchoscopist with a focus on the robotic sampling of micronodules. 

Outside of medicine, Dr. Schumacher finds joy in his family—married to Victoria in 2020, welcomed son Dean Wilder in 2021—and a loyal dog named Hoosier. Dr. Schumacher's interests span from Kurt Vonnegut's literature to Immanuel Kant's philosophy. He's dedicated to evidence-based medicine, writing, and passionately cheering for the Hoosiers and Cowboys sports teams.

To schedule an appointment with Dr. Schumacher and the Southwest Pulmonary Associates team, call the office or request an appointment online today.

Rebecca Doebele, MD, is a board-certified pulmonologist and critical care specialist who has been providing expert respiratory care to patients in Dallas, Texas, since joining Southwest Pulmonary Associates in 2008. Known for her compassionate approach and clinical excellence, Dr. Doebele treats a wide range of pulmonary conditions, including asthma, COPD, interstitial lung disease, and critical illnesses requiring intensive care.

Dr. Doebele earned her Bachelor of Science in Genetics from Texas A&M University in College Station before completing her Doctor of Medicine at the University of Texas Southwestern Medical School in Dallas. She remained at UT Southwestern for her residency in Internal Medicine, then pursued advanced fellowship training in Pulmonary and Critical Care Medicine at the University of Colorado Health Science Center.

Board-certified in both Pulmonary Medicine and Critical Care Medicine by the American Board of Internal Medicine, Dr. Doebele has been repeatedly recognized for her clinical skill and dedication to patient care. She was named a Super Doctors Rising Star in 2012 and has earned the prestigious Texas Super Doctors distinction annually from 2013 to the present. Additionally, she received the “Physician All-Star” award from the nursing and administrative staff at Texas Health Presbyterian Hospital of Dallas, a testament to her leadership and collaboration in the hospital setting. Dr. Doebele has been recognized as one of D Magazine’s best doctors in 2021, 2023, and 2024. She also serves as the ICU Medical Director at Texas Health Dallas. 

Outside of medicine, Dr. Doebele enjoys traveling and spending time with her husband and their three children. She is proud to serve the Dallas community and is committed to helping her patients breathe easier and live healthier lives.

Arhaanth Reddy, MD, is a board-certified pulmonologist at Southwest Pulmonary Associates in Plano, Texas. He is known for his expertise in diagnosing and treating complex respiratory conditions and for delivering evidence-based care with compassion and precision.

Dr. Reddy earned his medical degree from the University of California, San Diego School of Medicine, and completed his residency in internal medicine at UT Southwestern Medical School in Dallas, Texas. He went on to complete a fellowship in pulmonary and critical care medicine at UT Southwestern, where he also earned a Master of Science in Healthcare Leadership and Management. His academic excellence was recognized early on with election to the Alpha Omega Alpha Honor Medical Society and the prestigious Richard Mays Smith Award in Internal Medicine.

Dr. Reddy is triple board-certified by the American Board of Internal Medicine in Critical Care Medicine, Neurocritical Care Medicine, and Pulmonary Medicine.

In addition to his clinical work, Dr. Reddy serves as the current Vice Chair of the Department of Medicine at Texas Health Plano, where he helps shape the future of patient care, quality, and medical education.

Dr. Reddy offers a comprehensive range of advanced diagnostic procedures, including robotic bronchoscopy, endobronchial ultrasound (EBUS), and integrated 3D fluoroscopy, providing patients with cutting-edge evaluation and treatment options.

He has also been the recipient of several awards, including the:

• Alpha Omega Alpha Honor Medical Society, 2011
• Richard Mays Smith Award in Internal Medicine, UT Southwestern, 2011

Dr. Reddy chose a career in pulmonary and critical care medicine because he enjoys complex problem-solving and transforming insights into better outcomes for his patients.

Outside of medicine, he enjoys traveling, photography, reading, and, most of all, spending time with his three wonderful children.

Harman Kular, MD specializes in critical care and pulmonary medicine. He is board certified in internal medicine and pulmonary medicine and board eligible in critical care. Dr. Kular completed all of his medical educaton and training through Baylor College of Medicine, which allowed him to practice in a wide variety of settings within the Texas Medical Center, including the Harris Health System and the Veterans Affairs Health System. He believes in providing evidence-based, patient-centered care and has experience with a full spectrum of pulmonary conditions including infectious diseases as well as pleural and lung malignancies. 

Dr. Kular was born and raised in South Texas. He is a proud Houstonian, a faithful Astros fan and a Tex-Mex connoisseur. He lives in Houston with his wife, Sonia, and puppy, Sammy.