Meet Our Team

Our Extraordinary team of passionate physicians, clinical and Support Staff.

Interventional Radiologists

Interventional radiologists are board-certified physicians who utilize minimally invasive, image-guided procedures to diagnose and treat almost every organ system. Interventional radiology benefits the patient because it has less risk, less pain, and less recovery time than open surgery. Our IR team is well known for its expertise and has won awards for its innovative procedures.

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Dr. Steve Quarfordt

IR | Vascular

Dr. Steve Quarfordt received his medical degree from East Carolina University. He completed his internship and diagnostic radiology residency at Baptist Health System in Birmingham, AL. Dr. Quarfordt earned a vascular-internship fellowship from the University of Florida.

Dr. Quarfordt is board certified in diagnostic radiology and vascular interventional radiology by the American Board of Radiology.

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Dr. Justin Calvert

IR | Vascular

Dr. Justin Calvert Originally from Madison, Mississippi, Dr. Justin Calvert attended Mississippi College for undergraduate training before obtaining his medical degree from the University of Mississippi School of Medicine. Dr. Calvert completed an internship in general surgery at the University of Mississippi Medical Center in 2008 and completed his diagnostic radiology residency at Vanderbilt University Medical Center in Nashville, TN, in 2012, where he served as chief resident his final year. Dr. Calvert went on to complete fellowships in vascular and interventional radiology at the Northwestern McGaw Medical Center in Chicago, IL, in 2013, and neurointerventional surgery at the University of Tennessee College of Medicine in Chattanooga, TN, in 2014. Having a passion for patient and physician advocacy at the local and state level, Dr. Calvert served as President of the Chattanooga Hamilton County Medical Society in 2018 and has served on the Board of Directors for the Society since 2014. Leadership skills were prioritized early in Dr. Calvert’s career, and in 2016, he completed both the John Ingram Institute for Physician Leadership “Leadership Lab” and “Leadership Immersion Retreat” sponsored by the Tennessee Medical Association. Currently, Dr. Calvert serves as Chief and Chairman of the Department of Radiology at Erlanger Health System. In Dr. Calvert’s spare time, he enjoys boating, running, weight training, and traveling. 

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Dr. Harris Hawk

IR | Neuro

Dr. Harris Hawk received his medical degree from the Medical College of Georgia in 2006. He completed his internship and diagnostic radiology residency at the University of Virginia Hospital. Dr. Hawk earned a neuroradiology fellowship and an interventional neuroradiology fellowship from the Medical University of South Carolina.

Dr. Hawk is board certified by the American Board of Radiology. Some of his interests include spending time outdoors, biking, and cooking.

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Dr. Michael B Nichols

Interventional

Originally from Columbus, Ohio, Dr. Michael B. Nichols, M.D. attended Vanderbilt University School of Engineering for undergraduate training before obtaining his medical degree from the Vanderbilt University School Of Medicine. Dr. Nichols completed his internship at Riverside Methodist Hospital and completed his diagnostic radiology residency at Vanderbilt University Medical Center in Nashville, TN. Dr. Nichols went on to complete fellowships in Vascular and Interventional Radiology (Vanderbilt University) and Neurointerventional Surgery (University of Tennessee College of Medicine in Chattanooga, TN). Dr. Nichols is Board Certified by the American Board of Radiology. In his spare time Dr. Nichols enjoys spending time with his family, traveling, skiing, motorsports, and photography.

Diagnostic Radiologists

Many people do not know that radiology has subspecialties. We've worked very hard to find the best radiologists in each subspecialty so that only the most qualified radiologist reads a patient's exam. We also invest in our radiologists to keep them educated and trained in the newest imaging technology available.

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Dr. John Allred

Neuroradiology

Dr. John Allred received his medical degree from the University of Alabama School of Medicine in Birmingham, AL. He completed a residency program in diagnostic radiology at the University of Minnesota and a neuroradiology fellowship program at Vanderbilt University.

Dr. Allred is board certified by the American Board of Radiology. He is married to his wife, Rebecca, and they have two children. His interests include traveling, hiking, golf, and poker.

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Dr. Samuel Porter

Neuroradiology

Dr. Samuel Porter received his medical degree from the University of Tennessee Health Science Center in Memphis, TN. He completed an internship and a diagnostic radiology residency at the University of Tennessee Medical Center in Knoxville, TN. Dr. Porter is fellowship-trained in diagnostic neuroradiology, which he completed at Emory University School of Medicine in Atlanta, GA.

4th yr Medical Students
Vanderbilt School of Medicine
Vanderbilt University Medical Center

Photo: Anne Rayner; VU


Vanderbilt University Medical Center

Photo: Anne Rayner; VU

Jason Gregory Smith
2012 Class Composite 
Vanderbilt University School of Medicine
Vanderbilt University Medical Center


Photo: Anne Rayner;VU

Dr. Jason Smith

Neuroradiology

Originally from Columbus, Ohio, Dr. Jason Smith attended Vanderbilt University College of Arts and Sciences for undergraduate training before obtaining his medical degree from the University Of Vanderbilt School Of Medicine in 2012. Dr. Smith completed an internship in Preliminary Medicine at Naval Medical Center, in San Diego, California, in 2012 and completed his diagnostic radiology residency at The University of Texas Southwestern Medical Center in Dallas, Texas, in 2017. Dr. Smith went on to complete his fellowship in diagnostic neuroradiology at The University of Washington Medical Center in Seattle, Washington, in 2019. Dr. Smith is certified by the American Board of Radiology.

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Dr. Thomas Vaughan

Neuroradiology

After graduating from Beaverton High School in Oregon in 1982, Dr Vaughan attended Washington University in St. Louis, graduating with Honors with a BA in Biology in 1985. He then attended the Washington University School of Medicine on a Naval Health Professions Scholarship, and after graduating Alpha Omega Alpha in 1989, served four years in the US Navy as a Diving and Undersea Medical Officer. After completing his military service in 1993, Dr. Vaughan completed his Diagnostic Radiology Residency at the Mallinckrodt Institute of Radiology in 1997, serving as Co-Chief Resident in his final year. After completing a Fellowship in Neuroradiology at the University of Washington in Seattle in 1998, Dr. Vaughan entered private practice. He is Board Certified by the American Board of Radiology with a Certificate of Added Qualification in Neuroradiology, and is a Senior Member of the American Society of Neuroradiology. He lives with his family in Louisville, KY, where he enjoys hunting and competitive shooting, and rooting for the St. Louis Cardinals.

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Dr. Hari Challa

Pediatric and Neuroradiology

Dr. Hari Challa received his medical degree from Rangaraya Medical College in Kakinada, A.P., India. He completed a diagnostic radiology residency at Nizam's Institute of Medical Sciences. Dr. Challa is fellowship-trained in emergency radiology, pediatric radiology, and neuroradiology, which he completed at the University of Washington.

Dr. Challa is board certified by the American Board of Radiology.

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Dr. Michael Steiner

Pediatric

Originally from Brownsville, Tennessee, Dr. Michael Steiner attended The University of Tennessee for undergraduate training before obtaining his medical degree from The University of Tennessee School of Medicine in 2006. Dr. Steiner completed a transitional internship at Baptist Health Systems in 2007 and completed his diagnostic radiology residency at The University of Mississippi Medical Center in 2011. Dr. Steiner went on to complete his fellowship in pediatric radiology at Duke University in 2012. Dr. Steiner is certified by the American Board of Radiology.

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Dr. Jay Coleman

Pediatric

Originally from Coppell, Texas, Dr. Jay Coleman attended The University of Oklahoma for undergraduate training before obtaining his medical degree from The University of Texas Southwestern Medical School in 2014. Dr. Coleman completed an internal medicine internship as well as his diagnostic radiology residency at The University of Texas Southwestern Medical Center. Dr. Coleman went on to complete his fellowship in pediatric radiology at Children’s Medical Center in Dallas, Texas, in 2020.

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Dr. Tae Han

Pediatric

Dr. Tae Il Han received his undergraduate and medical degree from Kyunghee University College of Medicine, Seoul, Korea. He received his residence training in Diagnostic Radiology from there in 1996. Dr. Han completed two fellowships in Pediatric Radiology from Seoul National University Children’s Hospital in 1998.
Dr. Han in certified by the American Board of Radiology and the Korean Board of Radiology.

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Dr. Andrew Hill

Musculoskeletal

Dr. Andrew Hill received his medical degree from the Medical College of Georgia.  He completed his residency and a mini-fellowship in breast imaging and intervention at Brigham and Women's Hospital (Harvard Medical School) followed by a musculoskeletal imaging and intervention fellowship at the University of Virginia.

​Dr. Hill is board certified by the American Board of Radiology.

His personal interests include history, strength training, running, and golf.

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Dr. Agboola Awomolo

Musculoskeletal

Originally from Lagos, Nigeria, Dr. Agboola Awomolo attended Southern Illinois University for undergraduate training before obtaining his medical degree from The University of Illinois in 2012. Dr. Awomolo completed a transitional internship at Weiss Hospital in 2013 and completed his diagnostic radiology residency at Medical College of Wisconsin in 2017. Dr. Awomolo went on to complete his fellowship in musculoskeletal radiology at The University of Arizona in 2018. Dr. Awomolo is certified by the American Board of Radiology.

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Dr. Jose Barriocanal

Nuclear Medicine

Dr. Jose Barriocanal received his B.S. in chemistry from Georgetown University in 1992. He received a Ph.D. in chemistry at the University of Delaware. He earned his medical degree and completed his diagnostic radiology residency from Temple University School of Medicine. Barriocanal completed a nuclear medicine fellowship and a fellowship in PET/CT at Johns Hopkins Hospital in Baltimore, MD.

Dr. Barriocanal is board certified by the American Board of Nuclear Medicine.  Some of his interests include travel, soccer, and photography.

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Dr. Jared Burlison

Nuclear Medicine

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Dr. Patrick Henderson

Body Imaging

Originally from upstate South Carolina, Dr. Patrick Henderson attended The University of South Carolina for undergraduate training before obtaining his medical degree from The University of South Carolina School of Medicine in 2008. Dr. Henderson completed his internship in general surgery at The University of Tennessee Medical Center in 2009 and completed his diagnostic radiology residency at Augusta University in 2013. Dr. Henderson went on to complete his fellowship in body imaging at The University of California, San Diego, in 2014. Dr. Henderson is certified by the American Board of Radiology.

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Dr. Brent Baldwin

Body Imaging

Dr Brent Baldwin attended David Lipscomb University for undergraduate training before obtaining his medical degree from The University of Tennessee in Memphis, TN. Dr. Baldwin completed a transitional internship at The University of Tennessee Medical Center at Knoxville in 1990 and completed his diagnostic radiology residency at Vanderbilt University Medical Center in Nashville, TN, in 2002. Dr. Baldwin went on to complete a Body Imaging fellowship at Vanderbilt University Medical Center in 2003. Dr. Baldwin is certified by the American Board of Radiology. In Dr Baldwin’s free time he enjoys spending time with his wife and children, cooking, traveling, reading/history, and gardening.

Meet Our Clinical Staff

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Greg Smith

RPA

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Amanda Porter

NP

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Amy Knox

RN

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Amanda Palmer

RPA

Administrative Team

To contact a team member, please call (423) 778-7234 or email tiia@tiiarad.com.

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