Tennessee's Premier Urologic Health Care Specialists.

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Meet Our Team

Cutting-edge medical science meets a time-honored tradition of professional commitment.

Our Specialties

With 13 convenient locations throughout Tennessee, we're perfectly positioned to serve you!

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Our Doctors

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Mark G. Bowles, M.D.

(Oak Ridge/Harriman/Clinton)
Mark G. Bowles, M.D.

Dr. Bowles graduated from the University of Tennessee Medical School in Memphis, Tennessee in 1989. He completed his general surgery and urology post graduate training from the University of Tennessee College of Medicine in 1995. Currently, he serves as a clinical assistant professor of urology at the University of Tennessee Medical Center in Knoxville. Dr. Bowles is certified by the American Board of Urology.

Contact Dr. Bowles

Katherine M. Cameron, M.D.

(North Knoxville Medical Center/Park West/Lenoir City)
Katherine M. Cameron, M.D.

Dr. Cameron received her medical degree from the University of Tennessee, Memphis College of Medicine in 2002. She completed her post graduate training in surgery and specialty training in urology at the University of Alabama Birmingham. Dr. Cameron is certified by the American Board of Urology.

Contact Dr. Cameron

Stuart A. Chasan, M.D.

(Oak Ridge/Harriman/Clinton)
Stuart A. Chasan, M.D.

Dr. Chasan graduated from the University of Alabama School of Medicine in Birmingham, Ala., in 1981. He completed his post graduate training in general surgery and urology at the University of South Florida College of Medicine in 1986. He completed a urologic oncology fellowship at Roswell Park Memorial Institute in Buffalo, New York and was Assistant Professor of Urology at the State University of New York School of Medicine in Buffalo. Currently, he serves as a clinical assistant professor of urology at the University of Tennessee Medical Center in Knoxville. Dr. Chasan is certified by the American Board of Urology.

Contact Dr. Chasan

Walter W. Chiles III, M.D.

(Turkey Creek/Park West)
Walter W. Chiles III, M.D.

Dr. Walter C. Chiles III, earned his medical degree from the University of Tennessee College of Medicine in Memphis, TN in 1999. He served his general surgical residency and received his post graduate training at the University of Arkansas for Medical Sciences and was Chief Resident in the Department of Urology from 2004 thru 2005 in Little Rock, Arkansas.

He has been past Chief of Surgery at Baptist West Hospital and served on numerous hospital advisory committees.

Dr. Chiles III is a member of the South Central Section of the American Urological Association, the American Urological Association, and the American Association of Clinical Urologists. He was awarded the Phizer Scholar Award in Urology in 2004 and also has made a number of presentations at professional urological assemblies. Dr. Chiles was certified by the American Board of Urology in 2007 and is a Fellow of the American College of Surgeons.

Contact Dr. Chiles

Lee Congleton, M.D.

(North Knoxville Medical Center/Park West/Lenoir City)
Lee Congleton, M.D.

Dr. Congleton graduated in medicine from the University of Tennessee in 1985. Post graduate training in surgery and specialty training in urology was completed at the University of Kentucky and the Medical University of South Carolina in 1990. He is certified by the American Board of Urology, and he has practiced in Knoxville since 1990.

Contact Dr. Congleton

Brandon Cottrell, M.D.

(Oak Ridge/Harriman/Clinton)
Brandon Cottrell, M.D.

Dr. Cottrell graduated from the University of Tennessee Medical School in Memphis in 2003. He completed his general surgery and urology post graduate training at the University of Arkansas in 2009. Dr. Cottrell is certified by the American Board of Urology.

Contact Dr. Cottrell

Jeff E. Flickinger, M.D.

(Ft. Sanders/Alcoa)
Jeff E. Flickinger, M.D.

Dr. Flickinger graduated from Vanderbilt University School of Medicine in 1991. He completed his general surgery residency as well as his urologic surgery post graduate work at Vanderbilt University in 1997. Dr. Flickinger specializes in robotic surgery. He is certified by the American Board of Urology and a Fellow of the American College of Surgeons.

Dr. Flickinger, M.D. is also specialty trained in DaVinci procedures. CLICK HERE for more information.

Contact Dr. Flickinger

Christopher Harris, M.D.

(Turkey Creek/Park West)
Christopher Harris, M.D.

Dr. Christopher Harris obtained his medical degree from the University of Oklahoma College of Medicine in Oklahoma City. He served his internship and residencies at the University of Oklahoma Health Science Center in Oklahoma City. He was certified by the American Board of Urology in 1992 and recertified February 28, 2001 and is a Fellow of the American College of Surgeons.

Dr. Harris maintains memberships in several medical societies including the American Urological Association, Tennessee Medical Association,, the Knoxville Academy of Medicine and the American Association of Clinical Urologists. Dr. Harris also attends regular medical seminars and professional conferences to offer the newest advances in urology.

Contact Dr. Harris

R. Wayne Hatfield, M.D.R.

(Ft. Sanders/Alcoa)
R. Wayne Hatfield, M.D.R.

Dr. Hatfield graduated from The Medical College of Georgia School of Medicine in 1994. He completed his general surgery as well as his urologic surgery post graduate work at Vanderbilt University in 2000. Dr. Hatfield served in the U.S. Air Force at David Grant Medical Center in California until May 2003. He specializes in robotic surgery. He is certified by the American Board of Urology and a Fellow of the American College of Surgeons.

Dr. Hatfield, M.D. is also specialty trained in DaVinci procedures. CLICK HERE for more information.

Contact Dr. Hatfield

Krista Hodges, P.A.-C Physician Assistant

(North Knoxville Medical Center/Park West/Lenoir City)
Krista Hodges, P.A.-C

Krista received a Bachelor of Science in Nursing, Magna Cum Laude, from the University of Tn, Knoxville in 1992. After working as a Level One Trauma Nurse, being a member on the Cardiac Transport Team, and volunteering with EMS, she had a desire to even further her education and become a Physician Assistant. In 1997, she graduated Summa Cum Laude from the Bowman Gray School of Medicine program at Wake Forest University. She has since practiced in Emergency Medicine and Women’s Health, and joined the TUA team in 2014.

Contact Ms. Hodges

Timothy LeRoy, M.D.

(Turkey Creek/Park West)
Timothy LeRoy, M.D.

Dr. LeRoy earned his medical degree from the Brody School of Medicine at East Carolina in Greenville, North Carolina in 2006, earning Alpha Omega Alpha (AOA) distinction. He completed general surgery internship and urology surgical residency at the Mayo Clinic, Jacksonville, FL.

Dr. LeRoy maintains memberships in several societies, to further urology he has published professional articles, book chapters, and has several articles pending. Dr. LeRoy has sat on several committees’ and performed research in several areas.

He has joined the physician’s and staff at Knoxville Urology Clinic directly from his residency with the Mayo Clinic.

Contact Dr. LeRoy

Garrett Lischer, M.D.

(Turkey Creek/Park West)
Garrett Lischer, M.D.

Dr. Lischer received his medical degree from the University of Texas Medical School in Dallas Texas in 1998, earning Alpha Omega Alpha distinction. He completed a general surgery internship and urology surgical residency at the Mayo Clinic in Rochester, MN. He served as Chief Resident at the Mayo Clinic Department of Urology in 2003-2004. Dr. Lischer was certified by the American Board of Urology in February 28, 2006 and is a Fellow of the American College of Surgeons.

He has been past Chief of Surgery at Baptist West Hospital and has served on numerous hospital advisory committees. He serves on the board of directors for the Knox Area Stone Center.

Dr. Lischer maintains membership in many professional societies including the Mayo Fellows Association, The American Medical Association, The American Urologic Association, the American College of Surgeons and the American Association of Clinical Urologists. For the advancement of the field, Dr. Lischer has authored research grants, published professional articles and presented papers, abstracts and videos at professional urological assemblies.

Contact Dr. Lischer

Laura C. Moore, MSN, RN, FNP-BC

(North Knoxville Medical Center/Park West/Lenoir City)
Laura Moore, FNP-BC

Laura is a Board Certified Nurse Practitioner. She received her Master of Science in Nursing from Carson-Newman University in 2009. Laura also holds undergraduate degrees in both nursing and business. She began her nursing career in 2006 as a registered nurse. She has been a practicing nurse practitioner since 2009. Laura joined Tennessee Urology associates as a provider in January 2013. She cares for people and strives to give quality patient care and patient education. Her practice encompasses a broad spectrum of urologic services:

- Routine exams

- Kidney stones

- Urinary tract infections, acute and recurrent

- Interstitial cystitis

- Pre-operative and post-operative care

Laura is from East Tennessee and currently lives in the Maryville area.

Contact Laura Moore

John-Paul L. Newport, M.D.

(North Knoxville Medical Center/Park West/Lenoir City)
John-Paul L. Newport, M.D.

Dr. Newport graduated in medicine from the University of Tennessee, Memphis in 2005. Post graduate training in surgery and specialty training in urology were completed at the University of Kentucky in July, 2006. He is Board Certified.

Contact Dr. Newport

Eric R. Nicely, M.D.

(North Knoxville Medical Center/Park West/Lenoir City)
Eric R. Nicely, M.D.

Dr. Nicely graduated in medicine from the University of Tennessee, Memphis in 1985. Post graduate training in surgery and specialty training in urology were completed at Walter Reed Army Medical Center in Washington, D.C. where he remained as an attending urologist until 1994. He is certified by the American Board of Urology and he has practiced in Knoxville since 1994.

Contact Dr. Nicely

Brian Parker, M.D.

(North Knoxville Medical Center/Park West/Lenoir City)
Brian Parker, M.D.

Dr. Parker received his medical degree from Texas A&M College of Medicine in 1999. Post-graduate training in surgery and specialty training in urology were completed at Scott and White Memorial Hospital, Texas A&M University HSC COM. Dr. Parker is certified by the American Board of Urology.

Contact Dr. Parker

Randall E. Pearson, M.D.

(Oak Ridge/Harriman/Clinton)
Randall E. Pearson, M.D.

Dr. Pearson graduated from the University of Tennessee Medical School in Memphis in 1982. He completed his post graduate training in general surgery and urology at the University of Tennessee Medical School in Memphis in 1987. Currently, he serves as a clinical assistant professor of urology at the University of Tennessee Medical Center in Knoxville. Dr. Pearson is certified by the American Board of Urology.

Contact Dr. Pearson

Christopher E. Ramsey, M.D.

(North Knoxville Medical Center/Park West/Lenoir City)
Christopher E. Ramsey, M.D.

Dr. Ramsey graduated in medicine from the Medical College of Ohio in 1997. Postgraduate training in surgery and specialty training in urology was completed at the University of Oklahoma Health Sciences Center. Dr. Ramsey is certified by the American Board of Urology. Dr. Ramsey’s practice has a special concentration in robot assisted laparoscopic procedures, including prostatectomy, partial and total nephrectomy, pyeloplasty, cystectomy, and ureteral reconstruction.

Dr. Ramsey, M.D. is also specialty trained in DaVinci procedures. CLICK HERE for more information.

Contact Dr. Ramsey

Charles W. Reynolds, M.D.

(North Knoxville Medical Center/Park West/Lenoir City)
Charles W. Reynolds, M.D.

Dr. Reynolds received his medical degree from the University of Tennessee Medical School at Memphis in 1977. He completed his post graduate training in surgery and specialty training in urology at the University of Michigan at Ann Arbor in 1982. Dr. Reynolds is certified by the American Board of Urology and has practiced in Knoxville since completing his training in 1982.

Contact Dr. Reynolds

Preston Shepherd, M.D.

(Turkey Creek/Park West)
Preston Shepherd, M.D.

Dr. T. Preston Shepherd received his medical degree from the University of Tennessee in Memphis, TN. He served his internship and residencies at the Tulane University School of Medicine in New Orleans, LA and Alexandria, VA where he was chief resident in Urology. He was certified by the American Board of Urology in 1990 and recertified February 28, 2008 and is a Fellow of the American College of Surgeons. Dr. Shepherd attends regular medical seminars and professional conferences to continue to provide his patients with the latest state of the art care in urology.

Contact Dr. Shepherd

Adam Shrewsberry, M.D.

(Oak Ridge/Harriman/Clinton)
Adam Shrewsberry, M.D.

Adam Shrewsberry, M.D., is a graduate of Emory University School of Medicine, where he trained in urology. He graduated in June 2014. Dr. Shrewsberry has been a provider with Tennessee Urology Associates in Oak Ridge since August 2014. He specializes in the general urology.

Dr. Shrewsberry is a member of the American Urologic Association, Endourological Society, and Sexual Medicine Society of North America.

His clinical interests include:

- Kidney Cancer

- Bladder Cancer

- BPH

- Stone Disease

- Men’s Health

- Penile Prosthesis

- Robotic and Laparoscopic Surgery

Dr. Shrewsberry was the recipient of the prestigious HOPE (Housestaff Organization Professionalism Excellence) award in 2012; as well as First Place, Department of Urology Professionalism Team Project in 2012.

He makes his home in the Oak Ridge area with his wife and young son.

Contact Dr. Shrewsberry

Edward B. Tieng, M.D.

(Ft. Sanders/Alcoa)
Edward B. Tieng, M.D.

Dr. Tieng received his medical degree from Mount Sinai School of Medicine, New York in 1994. Post-graduate training in surgery and specialty training in urology were completed at Wilford Hall Medical Center, Lackland Air Force Base Texas from July 1994-June 2005. He specializes in robotic surgery. Dr. Tieng is certified by the American Board of Urology and a Fellow of the American College of Surgeons.

Dr. Tieng, M.D. is also specialty trained in DaVinci procedures. CLICK HERE for more information.

Contact Dr. Tieng

Zoe Varner, P.A.-C Physician Assistant

(Oak Ridge/Harriman/Clinton)
Zoe Varner, P.A.-C

Zoe Varner, PA-C is a graduate of the University of Tennessee, earning her Master of Science degree. She also earned her Master of P.A. Studies at South College. Zoe trained in urology at University of Tennessee Medical Center and has been a practicing physician’s assistant since 2012. Zoe has been a provider with Tennessee Urology Associates since 2013. Her practice encompasses a wide range of urologic services:

- Acute care in Urology

- Urinary incontinence

- Kidney stones

- Urinary tract infections

- Routine exams

- Diagnosing and developing treatment plans in the clinical setting

- Pre-Op and Post-Op care, etc.

Zoe makes her home in the Knoxville-Oak Ridge area.

Contact Ms. Varner

Our Specialties

Comprehensive Urologic Care, From Doctors You Can Trust!

You are encouraged to ask questions about our medical care during your office visits with your doctor. We are committed to making your visit to our office a pleasant one. This includes management of:

  • Bladder Cancer
  • Enlarged Prostate/BPH
  • Erectile Dysfunction
  • Kidney Cancer
  • Kidney Stones
  • Male Infertility and Sexuality
  • Minimally Invasive / Robotic Surgery
  • Prostate Cancer
  • Urinary Incontinence
  • Vasectomy
  • Vasectomy Reversal
  • And More

More About Us...

DaVinci© Surgery

A new category of surgery, enabled by the DaVinci© Surgical System, is being used by an increasing number of surgeons worldwide for prostatectomy and other urologic procedures. The board-certified surgeons at Tennessee Urology Associates are specialty-trained in DaVinci© procedures. This is a minimally invasive approach in which your surgeon utilizes the latest in computer and robotic technologies.

Ideal for Delicate Urologic Procedures, Such As:
  • DaVinci© Cystectomy
  • DaVinci© Partial Nephrectomy
  • DaVinci© Pyeloplasty
  • DaVinci© Radical Prostatectomy

Clinical Trials

Tennessee Urology Associates, PLLC participates in drug and device clinical trials for urology-related diseases and conditions. Volunteers can gain access to promising drugs and medical devices long before they are approved for the marketplace. The product is typically supplied to the volunteer at no charge and there is usually no charge for study-related exams, tests and procedures! Your doctor will be glad to discuss participation in clinical trials and answer any questions you have.

Learn More About Our Clinical Trials

Data Shows Clinical Advantages to Robotic Surgery


With a 3D view and greater dexterity, the DaVinci© Surgical Robot offers many advantages.

A new category of surgery, enabled by the DaVinci© Surgical System, is being used by an increasing number of surgeons worldwide for prostatectomy and other urologic procedures.

This minimally invasive approach, in which your surgeon utilizes the latest in computer and robotic technologies, is ideal for delicate urologic surgery. This includes prostatectomy—removal of the prostate gland to treat cancer—in which the target site is not only tightly confined but also surrounded by nerves affecting urinary control and sexual function.

The board-certified physicians at Tennessee Urology Associates, PLLC, in Knoxville, Tenn., are specialty-trained in DaVinci© procedures.

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