Our Physicians

Michael L. Dyer, M.D. is a graduate of the University of Tennessee’s College of Medicine in Memphis, Tennessee. He completed his anatomic and clinical pathology residency at the University of Tennessee Medical Center in Knoxville, Tennessee. Dr. Dyer is board certified in Anatomic and Clinical Pathology.

William Konomos, M.D. is board certified in both Anatomic and Clinical Pathology by the American Board of Pathology. His interests include gynecologic and breast pathology. Following an undergraduate degree from Duke University in Biomedical Engineering, he attended medical school at The Ohio State University and trained in Pathology at Indiana University/Methodist Hospital. Dr. Konomos is currently Medical Director of Fort Loudoun Medical Center laboratory and the Thompson Oncology Group Lenoir City laboratory. Dr. Konomos is president of IPS and has been listed as one of Knoxville’s Cityview magazine “Top Doctors”.

Zachary T. Lewis, M.D. is board certified in Anatomic and Clinical Pathology and has subspecialty training and board certification in Hematopathology. Dr. Lewis graduated from Mercer University with a degree in Environmental Science and Mercer University School of Medicine with a Doctor of Medicine degree. Residency and fellowship training was performed at Wake Forest University Baptist Medical Center. Dr. Lewis was on the faculty for the Wake Forest University School of Medicine as an assistant professor and has special interest in flow cytometry. Dr. Lewis is the Medical Director for Fort Sanders Regional Hospital laboratory as well as Quest Anatomic Pathology Lab in Knoxville. Dr. Lewis serves on the board of directors for Medic Regional Blood Center.

Citabria Holley, M.D. is a graduate of the Medical College of Georgia in Augusta, GA. She completed her Anatomic and Clinical Pathology residency at Wake Forest University Medical Center in Winston Salem, NC, followed by fellowship training in Surgical Pathology and Hematopathology, also at Wake Forest University. Dr. Holley has a special interest in Lymphoma and Myelodysplastic syndromes. She is board certified in Anatomic and Clinical Pathology and Hematopathology. She serves as the Laboratory Director for Summit Medical Group and LeConte Medical Center. Dr. Holley has been listed as one of Knoxville’s Cityview magazine “Top Doctors”.

Richard A. Sances II, M.D. is a graduate of the University of Virginia School of Medicine in Charlottesville, Virginia. He completed his pediatric residency training in Lexington, Kentucky at the University of Kentucky. After two years of private practice in pediatrics, he completed a pathology residency at the University of Tennessee in Knoxville. The following year he completed a pediatric pathology fellowship at Cincinnati Children’s Hospital in Cincinnati, Ohio. He is board certified in Pediatrics, Anatomic and Clinical Pathology, and Pediatric Pathology. Dr. Sances is the Medical Director for East Tennessee Children’s Hospital Laboratory.

Jeremy G. Vincent, M.D. is a graduate of the University of Tennessee College of Medicine in Memphis, TN. He completed his anatomic and clinical pathology residency at Johns Hopkins Hospital in Baltimore, Maryland, followed by a fellowship in Dermatopathology at the University of Michigan in Ann Arbor. Dr. Vincent has a special interest in Melanoma and Merkel cell carcinoma. He is board certified in Anatomic and Clinical Pathology as well as Dermatopathology. He is the Laboratory Director at Faculty Internal Medicine, Greater Knoxville Dermatology and Quest Diagnostics HUB in Knoxville, TN. Dr. Vincent has been listed as one of Knoxville’s Cityview magazine “Top Doctors”.

Russell G. Tipton, M.D. is a graduate of The University of Tennessee Health Science Center in Memphis, TN. He completed his residency in anatomic and clinical pathology at Emory University in Atlanta, GA. He followed residency training with a Dermatopathology fellowship at Saint Louis University in St. Louis, MO. Dr. Tipton is board certified in Anatomic and Clinical Pathology and Dermatopathology. Dr. Tipton is the Medical Director at both the Thompson Oncology Group laboratories in Blount County and West Knoxville.

Michael W. Susman, M.D., Ph.D. is board certified in Anatomic and Clinical Pathology. He completed his anatomic and clinical pathology residency at Vanderbilt University Medical Center in Nashville, Tennessee, followed by fellowships in Surgical Pathology and Hematopathology at Vanderbilt University Medical Center. Dr. Susman attended the Harvard/MIT MD-PhD Program and graduated with a Doctor of Medicine degree, as well as a Doctor of Philosophy degree in Neurobiology studying noncanonical Wnt signaling in the laboratory of Dr. Michael Greenberg.

Dr. Charlene Hellman Charlene Hellman, M.D., is board certified in Anatomic and Clinical Pathology, Hematopathology, and Molecular Genetic Pathology. She trained at the University of New Mexico and the University of Pittsburgh. She describes her work as solving puzzles inside the amazing human body.

Brandon E. Smithey, M.D. is board-certified in anatomic and clinical pathology and has subspecialty training and board certification in cytopathology. Dr. Smithey graduated from East Tennessee State University College of Medicine. He completed his anatomic and clinical pathology residency at University of Tennessee Health Sciences Center in Memphis, followed by fellowships in surgical pathology at Washington University School of Medicine in St. Louis and cytopathology at University of Virginia Health System in Charlottesville. Dr. Smithey has particular interest in ultrasound-guided fine needle aspiration for which he has conducted a busy clinic for several years. He is the director of anatomic pathology at Parkwest Medical Center.

Guy E. Nichols, M.D., Ph.D. is a graduate of the University of Virginia School of Medicine where he completed combined anatomic and clinical pathology residency, surgical pathology /cytopathology fellowship, and served on the faculty for 3 years as Assistant Professor of pathology. Dr. Nichols is board-certified in anatomic and clinical pathology, cytopathology and hematopathology.