Mark L. Allen, MD

Dr. Mark Allen graduated with highest honors from the University of Texas at Austin. He earned his medical degree from the University of Texas Medical School at San Antonio, where he was chosen for membership in Alpha Omega Alpha, the medical honor society. He completed his internship and residencies in surgery and in urology at the University of Tennessee Health Science Center in Memphis, TN.

Dr. Allen is certified by the American Board of Urology.

J. Scott Hassell, MD

Dr. Scott Hassell graduated with high honors in Biology from the University of Texas at Austin, where he was admitted to Phi Beta Kappa honor society. He earned his medical degree from the University of Texas Southwestern Medical School, Dallas. He trained as an intern and resident in surgery at the University of Texas Health Science Center, Houston. He pursued further post-graduate training in urology at St. Joseph Hospital, Houston.

Dr. Hassell is certified by the American Board of Urology.

Nancy Y. Kim, MD

Dr. Nancy Kim graduated magna cum laude from the University of Texas at Austin in 1993. She earned her medical degree from the University of Texas Southwestern Medical School, Dallas. She completed her residency at the University of Cincinnati, Ohio. She served as an Assistant Professor of Urology at the University of Texas Southwestern Medical School prior to joining North Dallas Urology in 2006. Dr. Kim practices General Urology with special interests in female incontinence, voiding dysfunction and stone disease. Dr. Kim and her Husband reside with their son and daughter in North Dallas.

Dr. Kim is certified by the American Board of Urology.

Stephen J. Lieman, MD

Dr. Stephen Lieman graduated cum laude from Case Western Reserve University in Cleveland, OH. He earned his medical degree from Baylor College of Medicine, Houston. He then performed his residency in surgery at the University of Texas at Houston. He completed his residency in urology at Baylor College of Medicine, Houston. He has several scientific presentations and publications to his credit.

Dr. Lieman is certified by the American Board of Urology.

Vince J. Rogenes, MD

Dr. Vince Rogenes completed his undergraduate education at the University of California, Irvine. He earned his medical degree from the Medical College of Wisconsin, Milwaukee. He trained as a surgical intern and resident in urology at the University of Texas Health Science Center at San Antonio.

Dr. Rogenes is certified by the American Board of Urology.