214-943-2200

Derek Williams, MD

Dr. Williams is fellowship trained in general and minimally invasive cardiovascular and thoracic surgery. He obtained his medical degree from Washington University in St. Louis School of Medicine, St Louis, MO, and completed his residency in General Surgery and his fellowship in Cardiothoracic Surgery at the University of Texas Southwestern Medical Center, Dallas, TX. Dr. Williams is board certified by the American Board of Surgery and the American Board of Thoracic Surgery.

Dr. Williams’ clinical interests include coronary revascularization, valvular heart disease, minimally invasive cardiothoracic surgery, transcatheter aortic valve replacement, and robot-assisted thoracic surgery.

Williams is a member of the Society of Thoracic Surgeons, the Southern Thoracic Surgical Association, the Eastern Cardiothoracic Surgical Society, the International Society for Heart and Lung Transplantation, the American College of Surgeons, and the American Medical Association. He is an experienced lecturer and presenter and has contributed numerous articles to medical journals.

Dr. Williams’ practice is located on the campus of Methodist Richardson Medical Center, with satellite offices at Methodist Charlton Medical Center and Methodist Dallas Medical Center.

In his free time, Dr. Williams enjoys golfing, triathlons, and spending time with his family.


Darien Bradford, MD

Dr. Bradford is an experienced Cardiothoracic Surgeon who earned his medical degree from Wayne State University School of Medicine. He later pursued his postdoctoral training from The University of Texas Medical Branch, where he was twice granted the honor of serving as Chief Resident. Throughout his career, Dr. Bradford’s outstanding work and commitment to excellence has brought him nation-wide recognition. Widely known for his minimally invasive surgical techniques, Dr. Bradford has twice topped the list for both Super Docs and Top Surgeons in America. He is dual board certified by the American Board of Surgery as well as the American Board of Thoracic Surgery. His clinical interests include Off-Pump Coronary Artery Bypass Grafting, minimally invasive cardiac surgery, endoscopic vein harvesting, redo coronary artery bypass grafting, ventricular restoration for congestive heart failure, surgery for atrial fibrillation, valve replacements and repair, minimally invasive thoracic procedures, lung cancer, and esophageal cancer.

In addition to his passion for working directly with patients, Dr. Bradford also has a rich background in teaching and research, and has written numerous publications as well as presented for several national conventions. When he is not working, Dr. Bradford enjoys spending quality time with his friends and family.

Education
Medical School: Wayne State University School of Medicine
Residency and Fellowship: The University of Texas Medical Branch


Mini L. Sivadasan, MD

Dr. Sivadasan specializes in minimally invasive cardiac surgery, robotic cardiac and thoracic surgery, and vascular/endovascular surgery. Her expertise in cardiac surgery includes minimally invasive valve surgery, off pump beating heart coronary revascularization, aortic surgery, concomitant valve/coronary surgery. Dr. Sivadasan’s clinical interests include robotic-assisted thoracic surgery, transcatheter aortic/mitral valve surgery, vascular and endovascular aneurysm surgery.

Dr. Sivadasan obtained her medical degree from Ross University School of Medicine and completed her residency in General Surgery at Mount Sinai Health System in New York, and completed her fellowship in Cardiothoracic Surgery at New York University Langone Health System. Dr. Sivadasan demonstrated exceptional dedication and performance during her residency, she was awarded the Outstanding Clinical General Surgery Resident Award, and the Outstanding Surgical Technical Skills and Excellence Award. Following her general surgery residency, Dr. Sivadasan continued to pursue specialized training by completing fellowships in adult cardiac and thoracic surgery, minimally invasive cardiac surgery, and robotic cardiac and thoracic surgery through New York University Langone Health System.

After surgical training, Dr. Sivadasan joined a leading cardiothoracic and vascular surgery group in Chicago, Illinois, CTVSA. Dr. Sivadasan was featured on Chicago’s WGN Channel 9 News for New Heart Valve Techniques in Minimally Invasive Cardiac Surgery in 2011. In 2013, Dr. Sivadasan was recognized by Advocate Health Care for Excellence in Cardiac Surgery. Dr. Sivadasan received the prestigious America’s Top Doctor Award from Southeastern Wisconsin in 2018. Dr. Sivadasan is certified by the American Board of Thoracic Surgery and has been serving as a Cardiothoracic and Vascular Surgeon since 2010.

In addition to her commitment to serving her patients, Dr. Sivadasan also has a passion for bringing quality medical care to those in need by offering her medical services to charitable hospitals and organizations all over the world including Mexico, Malaysia, and India. She is the founder of a non-profit charitable foundation in India, Healing Hands for Hearts Foundation. When she is not working, Dr. Sivadasan enjoys spending time with her family, fun activities with her daughter Lakshmi, and traveling.

Education
Medical School: Ross University School of Medicine – 2002 – Miramar, Florida
Residency: Mount Sinai Health System – 2007 – New York, New York
Fellowship: New York University Langone Health System – 2010 – New York, New York


Trisha Allen, PA

Trisha Allen, PA-C, is a board-certified physician assistant by the National Commission on Certification for Physician Assistants. She attended Syracuse University for her bachelor of science in Nutrition and Dietetics. She, then, went on to Massachusetts College of Pharmacy and Health Sciences where she earned her master’s degree in Physician Assistant Studies. Trisha assists Dr. Williams in surgery as well as in clinic and hospital settings. In her free time she enjoys spending time with her family, yoga and traveling.


Jacob Vintinner, PA-C

Jacob Vintinner, PA-C, is a board-certified physician assistant by the National Commission on Certification for Physician Assistants. He obtained his Bachelor of Science degree in Exercise Sports Sciences and Public Health from Texas Tech University. He, then, went on to the University of Tennessee College of Medicine where he earned his Master’s in Physician Assistant Studies. Jacob assists Dr. Williams in surgery as well as in clinic and hospital settings. In his free time he enjoys traveling, mountain biking, and playing golf.

Methodist Charlton Medical Center
3430 West Wheatland Road
POB I, Suite 202
Dallas, TX 75237
972-780-5888
Fax 972-780-5886
Methodist Richardson Medical Center
2821 E. President George Bush Fwy.
Suite 404
Richardson, TX 75082
214-943-2200
Fax 214-943-2201
Methodist Heart and Lung - Mansfield
2800 E. Broad St.
Suite 514
Mansfield, TX 76063
817-465-5311
Fax 817-465-8569