Cardiologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Chiropractor providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Dentist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Dermatologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Family Physician providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
OB-GYN providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Ophthalmologist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Orthopedic Surgeon providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Pediatrician providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Physical Therapist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Podiatrist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Psychiatrist providers include doctors, nurses, nurse practitioners, and physician assistants. They often maintain long-term relationships with you and advise and treat you on a range of health related issues.
Ramon (Ray) Kumar, M.D., is board-certified in cardiovascular disease and interventional cardiology. He specializes in coronary artery disease, peripheral vascular disease, congestive heart failure, palpitations, and valve disease. Dr. Kumar practices at HeartPlace Allen, Texas, where he is committed to providing the highest quality of care to his patients.
Dr. Kumar earned his Doctor of Medicine degree at UT Southwestern in Dallas, Texas. He completed his residency in internal medicine at Harvard Medical School/Beth Israel in Boston, Massachusetts, followed by multiple fellowships at the prestigious Texas Heart Institute in Houston, Texas.
Dr. Kumar has long served as a leader in the field of cardiology. His extensive experience includes directing catheterization labs and serving as STEMI Director in multiple healthcare systems, ensuring optimal care for acute heart attack patients. With his expertise in peripheral vascular interventions, complex coronary revascularization, and valve disease procedures, Dr. Kumar often manages challenging cases referred from across Texas and beyond.
Dr. Kumar’s dedication to his patients stems from a personal commitment to treating each individual like family, inspired by his own experiences. Outside of his medical practice, Dr. Kumar enjoys spending time with his wife and three children, weightlifting, swimming, playing pickleball, and exploring physics and philosophy.
BOARD CERTIFICATIONS:
Cardiovascular Disease
Interventional Cardiology
EDUCATION:
Fellowship, Interventional Cardiology: Texas Heart Institute, Houston, TX
Residency, Internal Medicine: Harvard Medical School/Beth Israel, Boston, MA
Medical School, MD Degree: UT Southwestern, Dallas, TX
HONORS & AWARDS:
Outstanding Resident Teacher Award, Harvard Medical School
Chief Interventional Fellow, Texas Heart Institute
OFFICE LOCATION:
HeartPlace Allen 1105 N. Central Expy., Bldg. 2 Ste. 2330 Allen, TX 75013
Nominated for Best Resident Teacher Award by medical students as residents (2002)
Elected UW Alumni Representative for class 2001 - University of Washington School of Medicine (2001)
Klea Bartirakas Award - Western Regional Medical Student Research Forum, Carmel, CA, Best Oral Presentation out of over 400 medical students from all over North America (2000)
Best Oral Research Presentation, National Student Research Forum, Galveston, TX - In Epidemiology and Infectious Diseases for AIDS project in North India (1999)
Elected Medical Student Association (MSA) Class Secretary (1999)
Ambulatory Care Achievement Award, Baylor College of Medicine (June 2014)
Outstanding Student Award, Department of Internal Medicine, Texas Tech School of Medicine (2011)
Alpha Omega Alpha Honor Medical Society (2010-present)
University Scholar Award (2005-2006, 2006-2007)
Honoree for College of Science Academic Excellence Reception (2003)
The National Dean's List (2002-2007)
PUBLICATIONS/MEDIA:
Thamwiwat, A, Sudhakar D, Paniagua D, and Denktas AE. Suspected coronary fat embolism after liposuction. Catheter Cardiovasc Interv. 2018;1-4.
Thamwiwat A, Levine GN. Chapter 14: Chest pains and Angina. Cardiology Secrets, 5th Edition. Ed. Glenn N. Levine. Philadelphia: Elsevier, 2018.125-134. Print.
Thamwiwat A, Mejia R, Nutman TB, Bates JT. (2014). Strongyloidiasis as a cause of chronic diarrhea, identified using next-generation Strongyloides stercoralis-specific immunoassays. Curr Trop Med Rep. 2014; 1:145-147.
Hira RS, Thamwiwat A, Kar B. Tandem. Heart placement for cardiogenic shock in acute severe mitral regurgitation and right ventricular failure. Catheter Cardiovascular Interv. 2014;82(2):319-322.
Dr. Asher Imam, D.O., F.A.A.N., is an experienced neurologist and neurophysiologist, specializing in neurology, clinical neurophysiology, vascular neurology, and sleep medicine. He is also the president and founder of Southlake Neurology & Sleep Wellness Clinic in Southlake, Texas.
At Southlake Neurology & Neurophysiology Clinic, Dr. Imam focuses on the diagnosis and treatment of acute and chronic neurological disorders, including epilepsy, multiple sclerosis, sleep disorders, and chronic headaches. He also served as the director of Baylor-Grapevine Comprehensive Epilepsy and Sleep Disorders Center in Grapevine, Texas. There, Dr. Imam treated patients with sleep and epileptic disorders while maintaining the integrity of the program by educating staff technicians and their certifications. He also served as a director of neurosciences at Baylor Scott and White Medical Center in Grapevine, Texas for 9 years where he started the stroke program. Dr. Imam also started the first stroke certified (Joint Commission) in Tarrant County at Medical Center of Arlington. He has been recognized as a Top Doctor by Fort Worth magazine and has received several awards for his compassionate approach to care and his dedication to patient satisfaction. Dr. Imam is a clinical adjunct professor of neurosciences at TCU-UNTHSC School of Medicine.
Certifications:
• Diplomate in the specialty of Neurology
• Diplomate in the subspecialty of Clinical Neurophysiology
• Diplomate in the subspecialty of Vascular Neurology
• Diplomate in the subspecialty of Sleep Medicine
Education:
• Fellowship in Clinical Neurophysiology (neuromuscular disorders and epilepsy) from
• Medical College of Georgia; Augusta, Georgia
• Residency in neurology from Medical College of Georgia; Augusta, Georgia
• Internal medicine internship from Medical College of Georgia; Augusta, Georgia
• Doctor of Osteopathic Medicine from University of North Texas health science Center at Fort Worth, Texas
• Bachelor of Science in Electrical Engineering from Lamar University Beaumont, Texas
Years of experience:
•Over 20 years of both inpatient and outpatient experience treating a wide variety of neurological disorders.
•Awarded Fellowship of American Academy of Neurology (FAAN) in 2022.
Previous leadership positions:
• Director of Baylor-Grapevine Comprehensive Epilepsy and Sleep Disorders Center
• Director of Baylor-Grapevine Stroke Center of Excellence
• Director of Stroke Program at Medical Center of Arlington
Awards:
• Living Magazine’s Best of North Texas 2020 and 2021
• Top Neurologist 2019
• Best of Physicians and Surgeons for 11 years in Southlake, Texas (2018)
• America’s Most Honored Profession 2018
• Patients’ Choice Award (Vitals) 2018
• Top Docs Texas Monthly 2015, 2018, 2019
• Super Docs (Tarrant County Addition) March 2014
• People’s Choice Award for Patient Satisfaction
• Physician of the month, July 2011, Baylor Scott and White Medical Center
• Featured on ABC, CBS and NBC prime-time news
• Top Docs of Fort Worth Texas, 2009
• Alpha Epsilon Delta and Phi Beta Pi Honor societies
• AMA/MSS Outstanding membership recruitment award
Suchitra Kaminen, MD, provides exceptional, cutting-edge care to a diverse group of patients at her North Dallas Primary Care Doctors office in Frisco, Texas. Certified by the American Board of Internal Medicine in both internal medicine and hospice and palliative medicine, she combines her expertise and extensive experience to help patients achieve their healthiest, most fulfilling lives.
Dr. Kamineni earned her medical degree from Kakatiya Medical College in Warangal, India. She then completed an internal medicine residency at Sinai-Grace Hospital—Detroit Medical Center in Michigan. She further specialized by completing a fellowship in hospice and palliative medicine at the University of Texas Health Science Center at Houston.
Dr. Kamineni utilizes her comprehensive training to deliver personalized care to each patient in her community. Her wide range of health services includes osteoporosis screenings, EKGs, Pap smears, preventive cancer screenings, and treatment for both common and complex conditions, such as hypertension, diabetes, high cholesterol, thyroid disorders, and asthma. Additionally, she offers annual wellness exams.
She is an active member of the American College of Physicians and the Indian Medical Association. Certified by the American Board of Internal Medicine in both internal medicine and hospice and palliative medicine, she combines her expertise and extensive experience to help patients achieve their healthiest, most fulfilling lives.
To schedule an appointment with Dr. Kaminen and the team at North Dallas Primary Care Doctors, call the office or request an appointment online today.
“I had a great experience with Dr. Suchitra at Kamineni MD Hospital in Preston Frisco. She is very knowledgeable, patient, and truly listens to her patients’ concerns. She took the time to explain everything clearly and made me feel comfortable throughout the visit. The staff was friendly and professional, and the clinic was clean and well organized. I really appreciated the care and attention I received and would highly recommend Dr. Suchitra to anyone looking for a caring and trustworthy doctor.”
Bishwas Upadhyay, MD, is a board-certified internal medicine physician at Texas Primary & Pediatric Care in Irving & Celina, Texas. Dr. Upadhyay’s philosophy in medicine is to help the body care for itself. He strongly believes in the power of preventive medicine and places high importance on the doctor-patient relationship. He is known for being attentive and articulate, and finds joy in educating and counseling his patients.
Dr. Upadhyay is originally from the Himalayan country of Nepal. He graduated from Nepalgunj Medical College in Nepal and completed his residency training in internal medicine at Presence Saint Joseph Hospital in Chicago, Illinois, where he served as a chief resident. Afterward, he joined the University of Nevada Reno School of Medicine as an assistant professor of medicine and later served as an academic hospitalist and associate program director for their internal medicine residency program.
In addition to taking care of his patients in the hospital, Dr. Upadhyay also taught medical students and residents in both hospital and primary care settings. During his tenure as the associate program director at the University of Nevada, he developed a quality improvement and patient safety curriculum. He also coached and mentored residents in their quality improvement and patient safety projects.
In addition to his board-certification, Dr. Upadhyay is a fellow of the American College of Physicians and received several awards and recognitions throughout his medical career. Dr. Upadhyay is fluent in English, Nepali, Hindi, and Urdu, allowing him to better serve the diverse patient populations in his community.
Outside of work, Dr. Upadhyay loves hiking, spending time with his family, and traveling. He is also an amateur cook.
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.
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.
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.
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.
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.
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