General & Thoracic Surgery
Administration
Diane Harnden
Director, Management Operations I
- Phone: 713.500.7365
- Email: Diane.Harnden@uth.tmc.edu
Crystal Sharp
Administrative Services Officer I
- Phone: 713.500.7304
- Email: Crystal.J.Sharp@uth.tmc.edu
Carmen Wallace
Sr. Grants and Contracts Specialist
- Phone: 713.500.7311
- Email: Carmen.W.Wallace@uth.tmc.edu
Director, DevelopmentScottie Wahlstrom
Sr. Executive Assistant / Fellowship Coordinator
- Phone: 713.500.7306
- Email: Scottie.Wahlstrom@uth.tmc.edu
- Assistant to: Dr. Kevin Lally
Claudia Loza
Sr. Staff Assistant
- Phone: 713.500.7274
- Email: Claudia.R.Loza@uth.tmc.edu
- Assistant to: Drs. Andrea Hayes-Jordan, Mary Austin, Michael Alexander Lypka, Michaelene Ribbeck, John Teichgraeber, KuoJen Tsao, Adam Vogel and Ruth Fleshman
Stephanie Baca
Research Coordinator I
- Phone: 713.500.7305
- Email: Stephanie.Baca@uth.tmc.edu
- Assistant to: Drs. Yong Li, Scott Olson, Fabio Triolo and Pamela Wenzel.
Christina McDonald
Research Coordinator I
- Phone: 713.500.7233
- Email: Christina.L.McDonald@uth.tmc.edu
- Assistant to: Drs. Charles Cox, Stacey Moore-Olufemi, Karen Uray and Supinder Bedi
Accounting and Billing
Clinical Billing Manager
Certified CoderMelissa Ramos
Insurance Verification Specialist
- Phone: 832.325.7343
- Email: Melissa.Torrez@uth.tmc.edu
Carolyn Vargas, CPC
Sr. Certified Coding Specialist
- Phone: 713.500.7362
- Email: Carolyn.R.Perez@uth.tmc.edu
Certified Coding Specialist 
Certified CoderResearch
Mary-Clare Day, RN, BSN
Clinical Trial Program Manager
- Phone: 713.500.7329
- Email: Mary-Clare.Day@uth.tmc.edu
Sr. Research Nurse Neurosurgery, Orthopedic and Acute Care
Lidia Valdez
Executive Assistant
- Phone: 713.500.7285
- Email: Lidia.R.Valdez@uth.tmc.edu
- Assistant to: Drs. Stephen Fletcher, John Jones, Shiraz Younas and Pedatric Acute Care Practitioners
Marlon J. Alexander, MS, PA-C
Physician Assistant - Pediatric Orthopaedic Surgery
- Phone: 713.500.7300
- Email: Marlon.Alexander@uth.tmc.edu
Plastic & Craniofacial Surgery
Ruth G. Fleshman, LCSW
Clinical Coordinator / Social Work
- Phone: 713.500.7302
- Email: Ruth.G.Fleshman@uth.tmc.edu
Cardiovascular Surgery
Ana Duenez
Sr. Staff Assistant
- Phone: 713.500.7339
- Email: Ana.Duenez@uth.tmc.edu
- Assistant to:Drs. William Douglas and Michael Hines
Nurse Coordinator Rebecca M. Sam, RN, CPN, CCRN
Nurse Coordinator
- Phone: 713.704.5746
- Email: Rebecca.M.Sam@uth.tmc.edu
Perfusionist 
Perfusionist
Clinical Offices
6410 Fannin Street
Suite 950
Houston, Texas 77030
832.325.7234
Administrative Offices
6431 Fannin Street
Houston, Texas 77030
713.500.7300
