Doctors and Staff


Luis M. Pérez, MD, FAAP, FACS

Dr. Pérez, a native of Cuba, moved to the United States at the age of 9 years. He began private practice in Charlotte in June 2001. He is married with 3 children. He was previously an associate professor of surgery (pediatric urology) at the University of Alabama at Birmingham (UAB) School of Medicine. He was on the UAB university faculty for 6 years, practicing at the Children's Hospital in Birmingham, a freestanding private children's hospital. He has written or co-authored over 40 original scientific articles and book chapters. He has made over 80 national and international original scientific presentations. He has traveled to Ecuador, Honduras, and El Salvador on medical mission trips. He was board certified by the American Board of Urology in 1997.

Medical Society Memberships:
Fellow, American Academy of Pediatrics
Fellow, American College of Surgeons
Fellow, Society of Pediatric Urology
Member, Society for Fetal Urology
Member, American Urological Association
Member, Southeastern Section, American Urological Association

2001 - Present Private Practice, Pediatric Urology, Charlotte, NC
1995 - 2001 Associate and Assistant Professor Children's Hospital, University of Alabama at Birmingham Birmingham, AL
1994 - 1995 Fellowship, Pediatric Urology, Egleston and Scottish Rite Children's Hospitals, Emory University, Atlanta, GA
1990 - 1994 Residency, Urologic Surgery, Duke University Medical Center, Durham, NC
1988 - 1990 Resident, General Surgery, Duke University Medical Center, Durham, NC
1984 - 1988 Medical School, Alpha Omega Alpha, Albert Einstein College of Medicine, Bronx, NYC
1980 - 1984 Undergraduate Degree, Bachelor in Science (Chemistry), Magna Cum Laude, Seton Hall University, South Orange, NJ

Winifred A. Owumi, MD

Dr. Owumi recently completed a Fellowship in Pediatric Urology at Stanford University (2014) after which she started in private practice in Charlotte, North Carolina (January 2015). Dr.Owumi completed her medical school, general surgery residency and fellowship training at Stanford University. Her comprehensive medical training in such an esteemed research institution afforded her many research, clinical and volunteer opportunities. Dr. Owumi’s scientifc and medical research achievements and interests have been duly recognized and reflected in her numerous scientific presentations, publications and awards at various conferences. Dr. Owumi’s interests also extend to mission work and other volunteer activities, such as with The International Volunteers in Urology (IVUmed), most recently in Swaziland and Uganda. Furthermore, Dr. Owumi is actively involved with a mobile health clinic non-governmental organization in Nigeria, HEFMAC (Health Foundation for Maternal and Child Care), which provides medical education, screening and free medical and surgical care to rural communities.

Dr. Owumi is married with 3 children and lives in Charlotte, North Carolina.

Medical Society Memberships:
Member, Society of Pediatric Urology
Member, American Urological Association

Member, Southeastern Section, American Urological Association
Member, American Medical Association
Member, National Medical Association
Member, Society of Women in Urology

Education & Career:

2015 - Present Private Practice, Pediatric Urology, Charlotte, NC

2012 - 2014 Fellowship, Pediatric Urology, Lucile Packard Children's Hospital, Stanford, CA
2008 - 2012 Residency, Urologic Surgery, Stanford University Hospital and Clinics, Stanford, CA

2006 - 2008 Resident, General Surgery, Stanford University Hospital and Clinics, Stanford, CA
2001 - 2006 Medical School, Stanford University, Stanford, CA

1997 - 2001 Undergraduate Degree, Bachelors of Science (Biology), Summa Cum Laude, Lewis University, Romeoville, IL

Mark A. Williams, MD, FAAP, FACS

Dr. Mark Williams is a native of Rome, Georgia and a graduate of the Medical College of Georgia in Augusta, Georgia. After graduating medical school he completed his residency in Urology at the University of Tennessee Health Science Center in Memphis. He then completed a fellowship in Pediatric Urology at UTHSC and LeBonheur Children’s Hospital. From 1993 until 2002 he worked as a pediatric urologist in private practice in Charlotte. He returned to Memphis to serve as a faculty member with UTHSC from 2002 until 2015, most recently as Associate Professor and Chief of Pediatric Urology with UTHSC Department of Urology. During his time with the University’s Department of Urology he has participated in clinical research as well as resident education, and has served as the Program Director for UTHSC’s pediatric urology fellowship program.

Dr. Williams has held many leadership roles including a faculty appointment and Division Chief of pediatric urology for St Jude Children’s Research Hospital, as well as Division Chief at LeBonheur Children’s Hospital in Memphis. He was selected to serve as the first Surgeon-in-Chief for LeBonheur Children’s Hospital representing the surgical services and participating in strategic planning efforts for the hospital.

His interests include pediatric urological oncology and management of prenatally detected hydronephrosis. He is Board certified by the American Board of Urology and holds a Certificate of Added Qualification in Pediatric Urology from the ABU. He is a Fellow in the American College of Surgeons, the American Academy of Pediatrics, Section of Urology, and the Society for Pediatric Urology.


Meredith Ramirez

Office Manager

Meg Williams