TTUHSC School of Medicine at Amarillo
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Internal Medicine

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General Internal Medicine

SmalliganRoger D. Smalligan, M.D., MPH, FACP, FAAP

Regional Chair

Roger D. Smalligan, MD, MPH, FACP, FAAP, joined the faculty as the Regional Chair of the Internal Medicine Department at Amarillo in 2009. He graduated from the Johns Hopkins School of Medicine and then completed an Internal Medicine and Pediatrics residency at Vanderbilt University.He then pursued an MPH at Johns Hopkins and later served for 9 years in Ecuador as the medical director ofa jungle-based mission/teaching hospital prior to returning to academic medicine in the United States in 2004. At East Tennessee State University Dr. Smalligan was a clinician-educator in Internal Medicine and Pediatrics and was later named the Division Chief of General Internal Medicine. In addition to publishing numerous abstracts and articles, Dr. Smalligan has won teaching awards and enjoys mentoring medical students and residents. Outside of the hospital you will find him spending time with his wife and four children as well as running, playing basketball, and participating in church activities.


Bharat Khandheria, M.D.,MBA, FACP

Program Director for Internal Medicine Residency Program

Bharat Khandheria, M.D.,MBA, FACP, joined the Texas Tech School of Medicine at Amarillo faculty in 1993 after completing his residency here in Internal Medicine. He received his undergraduate and medical education in India at Bhowanipore Education Society College and North Bengal Medical College, respectively. He completed a one-year internship in Internal Medicine at Mount Carmel Mercy Hospital in Detroit, Michigan before entering the Texas Tech-Amarillo residency program, where he was recognized by the faculty of the Department of Internal Medicine as "Outstanding Resident of the year" 1991-1992.Dr.Khandheria also obtained the Master of Business Administration with emphasis on health care in 2011from Texas Tech Rawls School of Business.

Currently Dr. Khandheria is an Associate Professor and Program Director for Internal Medicine Residency Program and leader of Adolescent Medicine efforts within the Department of Pediatrics.

Dr. Khandheria is board-certified in Internal Medicine and possesses a Certificate of Added Qualification in Adolescent Medicine. He is a Fellow of the American College of Physicians. He has several peer-reviewed publications and a book chapter to his credit.



Karen Cutts, M.D.

Clinic Director

Karen Joyce Cutts, M.D., joined the Texas Tech School of Medicine at Amarillo faculty in 1986 as an Internal Medicine resident and joined the faculty in the Department of Internal Medicine in 1989. She is currently an Associate Professor of Clinical Medicine.

Cutts received a Bachelor of Science degree in nursing from the University of Colorado School of Nursing in 1979. From 1979 to 1985, Dr. Cutts served as a registered nurse in the medium-risk nursery at University Hospital, Denver. In 1986, she received her M.D. degree from the University of Colorado School of Medicine. Dr. Cutts then came to Amarillo where she completed her specialty training in Internal Medicine.

Dr. Cutts is active in the Amarillo community. She is currently a member of the Junior League of Amarillo, a board member of Planned Parenthood of Amarillo, and a member of the Association of American University Women. She has had memberships in other area organizations such as the Amarillo Professional Network and African-American Women Association.

She is a past advisory board member of Sunshine Health Services and Outreach Health Services, a past participant in the United Citizen's Forum "Stay in School" program, and a past participant in Team Amarillo.



Robert S. Urban, M.D., FACP

Vice Chair

Master Teacher

Endowed Professorship In Internal Medicine

Robert S. Urban, M.D., FACP, joined the fulltime faculty of TTUHSC-Amarillo as Associate Professor in July 2000, although his academic relationship with the department dates back to 1989. He served as Internal Medicine Residency Program Director until June 2003. In 2004 he became the Internal Medicine Student Clerkship Director. Dr. Urban has earned numerous teaching awards from residents and students. In 2007 he received the Presidents' Excellence in Teaching Award. He has been President of the Faculty Council.

Dr. Urban earned a Bachelor of Arts degree in English and graduated summa cum laude from Texas Christian University in 1973. He then received his medical degree from Baylor College of Medicine, graduating magma cum laude, in 1978. This was followed by Internal Medicine residency at the University of Texas Southwestern Medical School, where he was chief resident, and board certification in Internal Medicine in 1981. Dr. Urban returned to the Panhandle to enter the private practice of general Internal Medicine in Amarillo.

Dr. Urban has been an executive committee member of the following civic organizations: The Amarillo Area Foundation, the Don & Sybil Harrington Cancer Center and the Coffee Memorial Blood Center. He is also a member of several professional organizations including the Potter-Randall County Medical Society, the Texas Medical Association, the American College of Physicians, Alpha Omega Alpha, and Phi Beta Kappa.



James "Whit" Walker, M.D.

Clerkship Director for 4th Year Internal Medicine Rotation

Dr. James “Whit” Walker grew up in Amarillo and graduated from Amarillo High School.  He then attended Texas A&M undergraduate, University of Texas Southwestern Medical School in Dallas, then University of Alabama at Birmingham for Residency in Internal Medicine.  He has worked in Amarillo since 1993 including time at the J. O. Wyatt clinic in indigent care and the Jan Werner Adult Day Care (PACE program) for the elderly where he has consistently received high marks from medical students for teaching.  He is board certified in Internal Medicine and Palliative Care.  He has served on the board of Directors of CareNet Crisis Pregnancy Center and Panhandle Aquatics.  In his spare time he serves as the swim coach at San Jacinto Christian Academy, where his four children have attended, and two have graduated.  He has travelled to several developing countries on short term medical missions trips. 



doc Jack Waller, M.D.


Dr. Jack Waller grew up in the Texas Panhandle where he attended Sunray public schools.  He attended The University of Texas at Austin and then continued on to medical school at the University of Texas Medical Branch in Galveston.  Dr. Waller trained in dermatology at the Brooke Army Medical Center at Ft. Sam Houston, TX.  Dr. Waller returned to Amarillo and started his dermatology practice in 1975.  Dr. Waller holds patents on an innovative Cryosurgical Spraying Apparatus and Moisture collecting Chamber.  He has served as President of the Potter-Randall Medical Society and has served on the Board of Directors for the American College of Cryosurgery. 

Dr. Waller is currently an Associate Clinical Professor of Dermatology with Texas Tech University Health Sciences Center and actively teaches medical students and residents at the Amarillo campus.  Dr. Waller travels with several medical mission teams each year to underserved areas and is the Chief Flight Surgeon for the Honor Flight operated by America Supports You, Amarillo, Texas chapter.

Hospitalist Medicine

Rahul Chandra

Rahul Chandra, M.D.

Dr. Rahul Chandra obtained his MBBS from the University College of Medicine Sciences of Delhi, where he was first in pathology and first in biochemistry. He did an internship and residency at Weill Medical College of Cornell University and joined us in 2007 as an Assistant Professor.

Dr. Chandra's research interest involve ventilaroy management. He submitted posters about extubation failure rates and unplanned extubations at the 2006 and 2007 American Thoracic Society meetings. He previously volunteered with the World Health Organiztion Pilot Program for Polio eradication. He is fluent in English, Hindi, and Spanish.

docMashrafi Ahmed , M.D.

Resident Scholarly Activity

Dr. Mashrafi Ahmed received his MBBS from Dhaka Medical College, Bangladesh and also completed his post-graduate training at Bangabandhu Sheikh Mujib Medical University. He completed his internship and residency in Internal Medicine at Saint Joseph Hospital affiliated with University of Illinois at Chicago. He joined Texas Tech University in 2012 as an Assistant Professor.


Dr. Ahmed is also the Director of Residents’ Scholarly Activity. He oversees residents’ research projects, poster and clinical vignette presentation in different scientific seminars. His research interest is hematology and solid tumors. He was the chief investigator in few research projects like – demographic variation of Ki67 in triple negative breast cancer, relation of thrombocytopenia, MELD score and splenomegaly in chronic liver disease, normal reference range of schistocytes and burr cells in general population, nilotinib level monitoring with concomitant use of CYP3A4 inhibitors. He presented numerous posters and clinical vignette in different scientific seminars and won awards on different occasions.



ASM Islam, M.D.

Associate Program Director of Internal Medicine Residency

Dr. ASM Islam M.D., joined the Texas Tech School of Medicine at Amarillo faculty as an Assistant Professor and Associate Program Director in July, 2013 after completing his Internal Medicine Residency from Texas Tech University at Amarillo campus. He also served as the Chief Resident at his program for the academic Year 2012-2013.

Dr. Islam received his medical degree and graduated from Dhaka Medical College, Bangladesh and also did his post- graduate training in Internal Medicine at National Heart Foundation Hospital and Bangladesh Institute of Research and Rehabilitation in Diabetes, Endocrine and Metabolic Disorders Hospital (BIRDEM). His special field of interest is Cardiology and he presented numerous oral presentations and posters at various regional and national meetings and scientific seminars. During his residency Dr. Islam received many awards for his leadership and teaching skills including the " Outstanding First Year Resident- Internal Medicine" and "Residents' Choice " award. He has keen interest in Graduate Medical Education and in advancing medical education and residency training through innovations. Outside of medicine he enjoys in listening music, watching and playing various outdoor sports such as soccer and cricket.



Walter Allison, M.D.

Dr. Walter Allison received his undergraduate degree from Union University and his M.D. degree from the University of Tennessee, where he was elected to Alpha Omega Alpha Honor Medical Society. He did an internship and residency at the University of Tennessee and a cardiology fellowship at St. Paul Hospital in Dallas.

Dr. Allison was in private medical practice and has served as the VA staff cardiologist since 1972. He has served as Chief of Cardiology, Chief of Medical Staff, Medical Director of the Coronary Care Unit and Medical Director of the Cardiac Rehabilitation Program, all at Baptist St. Anthony's Hospital in Amarillo.

In 2006 Dr. Allison joined as an Associate Professor and divides his time between the medical school and the Amarillo VA Medical Center. He runs the cardiology service at Northwest Texas Hospital and the VA.

Critical Care Medicine

Dr. Kishore Yalamanchili

Kishore Yalamanchili, M.D.

Division Chief of Pulmonary Diseases and Critical Care Medcine

Kishore Yalamanchili, M.D. added Pulmonology and Critical Care Medicine expertise with his addition to the Texas Tech School of Medicine at Amarillo Internal Medicine faculty in July 2005. He is board-certified in Internal Medicine, Pulmonary Diseases, and Critical Care Medicine.

Dr. Yalamanchili grew up in the Houston, Texas area and received his Bachelor of Science in Biology and Chemistry, Magna Cum Laude, from Houston Baptist University. He achieved his medical degree at the University of Texas Medical School at San Antonio, followed by an Internal Medicine residency at UTMB-Galveston and most recently, his Pulmonary and Critical Care Fellowship at Louisiana State University Health Science Center- New Orleans.

Dr. Yalamanchili brings the latest in Pulmonology to our ICU and consultative services. His wife, Chandana, recently completed her Texas Tech Internal Medicine residency and now serves as a hospitalist at Northwest Texas Hospital.




Dr. Harold Werner

Harold Werner, M.D., FACE

Harold Werner, M.D., FACE, joined the faculty at Texas Tech Amarillo in 1992. He is currently Professor in the Department of Internal Medicine, and Associate Professor in the Texas Tech School of Pharmacy. Prior to coming to Texas Tech, Werner was director of the Diabetes Center at the Ozarks Medical Center, West Plains, Missouri.

Dr. Werner has a Master of Arts in Biochemistry from the University of South Dakota and his medical degree from Northwestern University in Chicago, followed there by internship, residency in Internal Medicine, and an Endocrine fellowship. He completed research fellowships at Washington University Medical School in St. Louis and McGill University Medical in Montreal.

Dr. Werner is board-certified by the American Board of Internal Medicine in the specialties of Internal Medicine, Endocrinology - Metabolism, and Geriatrics. He is a Fellow of the American College of Endocrinology and a charter member of the Texas Tech Teaching Academy. Dr. Werner holds memberships in the Potter-Randall County Medical Society, Texas Medical Association, and the American Association of Clinical Endocrinologists. He has numerous publications to his credit. His latest book, Werner's Office Diagnosis, is an original approach to that subject. Dr. Werner was awarded the Presidents' Excellence in Teaching Award in 1995.

Outside Texas Tech, Dr. Werner has served on the boards of the Amarillo International Club, Amarillo Heart Association and the Amarillo Symphony.



docRavindra M. Bharadwaj, M.D.

Geriatrics Clerkship Director

Dr. Ravindra (Ravi) M. Bharadwaj joined as Associate Professor in the Division of Geriatrics, at Texas Tech University Health Sciences Center, in September of 2012. Dr Bharadwaj is Clerkship Director-Geriatric Rotation of medical students. He came from Indiana and Purdue Universities in Indianapolis where he pursed a MPH from Indiana University in epidemiology and biostatics.

Dr. Bharadwaj graduated from Lucknow Christian College in Lucknow, India, with a degree in physics. He continued his education at King George’s Medical College in India, where he earned his medical degree and completed his residency training in internal medicine. Dr. Bharadwaj continued his training at the Kingsbrook Jewish Medical Center in New York before moving to the Loyola University/Hines VA Hospital in Illinois where he completed a Geriatric Fellowship.



Dr. Bharadwaj is board certified in geriatrics and internal medicine. He is currently a member of the American Geriatric Society, American College of Physicians-American Society of Internal Medicine and the Association of Physicians of India.

Dr. Bharadwaj’s interests include Internal Medicine and Geriatrics care with special focus on Alzheimer’s disease treatment and research.

Dr. Bharadwaj spends his free time with family and playing Tennis. Dr. Bharadwaj is married and blessed with two daughters.


docMarge Dean



Marge is a geriatric nurse practitioner with over 20 years of experience as a nurse practitioner/educator who is dually appointed in the Department of Internal Medicine and the School of Nursing.   She provides primary care for patients ages 55 and older and has special interest and experience in the area of diagnosing and treating Alzheimer’s disease and other dementias.  Marge is actively involved in geriatrics research projects and is the author of a number of book chapters.  She enjoys teaching medical students and nurse practitioner students for Texas Tech University Health Sciences Center.


She also serves the community by working with Adult Protective Services, making home visits with social workers to determine the suitability of living conditions and the ability of patients for self-care.


Infectious Disease


Dr. Scott Milton


Scott J. Milton, M.D.

Division Chief of Infectious Disease

Dr. Scott Milton received his Medical Degree from the University of Texas Medical School at Houston. He trained in Internal Medicine at the Medical College of Georgia and finished his fellowship in Infectious Diseases at Vanderbilt University in 1996. Prior to joining the faculty at Texas Tech Medical School in Amarillo he was in private practice for twelve years at Amarillo Diagnostic Clinic. His current interests include Influenza, community acquired MRSA and Travel Medicine.

Women's Health


Dr. Marjorie Jenkins

Marjorie Jenkins, M.D.

Executive Director, Laura W. Bush Institute for Women's Health

Marjorie Jenkins, M.D. received her undergraduate degree in chemical engineering. After several years in the chemical industry, she attended medical school at East Tennessee State University . She then completed her residency at the University of Cincinnati in Cincinnati, Ohio. Dr. Jenkins conducted an internal medicine private practice prior to pursuing a career in academics.

Dr. Jenkins earned the Special Dean's Award, OB/Gyn Award, and Janet M. Glascow Award, which is presented to a woman graduating first in her class. She is a member of Phi Kappa Phi and Alpha Omega Alpha honor societies.

Dr. Jenkins joined TTUHSC with a joint appointment in Internal Medicine/OB-GYN in June 2001 at the rank of Assistant Professor, promoting in 2005 to Associate Professor. Her special focus is Women's Health, including the development of our Women's Health Fellowship. Dr. Jenkins is also Executive Director of the Laura W. Bush Institute for Women's Health in Amarillo at Texas Tech University Health Sciences Center. In 2006 she received the Dean's Distinguished Service Award. Her current research is directed toward osteoporosis and postmenopausal hypertension.


Collaborating Community Faculty



David Brabham, DO


Dr. David Brabham is an Interventional Cardiologist who is a graduate of the University of Houston and the Texas College of Osteopathic Medicine. Dr. Brabham completed his medical residency and fellowship in Cardiology at Scott and White Memorial Hospital in Temple Texas. He then completed an Interventional Cardiology Fellowship at the University of Rochester Medical Center in Rochester New York.







M Tarek H Naguib, MD, MBA, FACP


A graduate of Cairo University in Egypt, Dr. Naguib has received his postgraduate training from the Oklahoma University Health Sciences Center. He has been recertified by the American Board of Internal Medicine in the fields of Internal Medicine, Infectious Disease, and Nephrology. Although he has been in private practice since 1995, Dr. Naguib has been actively involved in teaching as a clinical faculty at the Oklahoma University Health Sciences Center and, since 2008, at the Texas Tech University Health Sciences Center in Amarillo. He was awarded an AMA National Foundation Leadership Award and the Dean's Community Faculty Award from TTUHSC, among others. Dr. Naguib has published in different areas of Internal Medicine and has done review, editorial, and blog work. In addition to an MBA in healthcare from George Washington University, Dr. Naguib has been involved in hospital governance for 2 decades including work on the governing board, executive, and credentialing committees, director of dialysis, case management and hospital epidemiology. He sees his mission as to enrich academic medicine through teaching, writing, leadership, and individualized innovative patient care.




Faisal Khasawneh, M.D.

Infectious Diseases

Faisal Khasawneh, M.D., joined the faculty of Texas Tech School of Medicine at Amarillo as an Assistant Professor in 2009. He received his M.D. degree from Jordan University of Science and Technology in 1998 and then completed his Internal Medicine Residency at the Henry Ford Hospital in Detroit, MI. Subsequently, he did a fellowship in Critical Care Medicine at Detroit Medical Center/Wayne State University in Detroit, MI and a second fellowship in Infectious Diseases at Tulane University in New Orleans, LA. He is currently board certified in Internal Medicine, Critical Care Medicine, and Infectious Diseases and is serving as the Director of the Intensive Care Unit at Northwest Texas Hospital in Amarillo.Dr. Khasawneh has a special interest in critical care echocardiography in which he has a postgraduate diploma in Perioperative and Critical Care Echocardiography through the University of Melbourne, Australia in 2009.