TTUHSC School of Medicine at Amarillo
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Faculty Profiles

Faculty Profiles


Division of General and Acute Care (Trauma Critical Care)

Surgeons in the Division of General Surgery specialize in the management of patients and the performance of surgery on these patients for diseases and abnormalities of a wide variety of organs and body systems. These organs and systems include: internal abdominal organs - the esophagus, the stomach, the gall bladder, the spleen, the liver, the pancreas, the small and large intestines, and the adrenal glands; the structures of the neck to include the thyroid and parathyroid glands, the trachea, the esophagus and the salivary glands; all non cosmetic conditions of the breast; all varieties of hernias - inguinal, femoral, incisional, ventral and diaphragmatic. Our General Surgeons also perform limited vascular and non cardiac thoracic procedures, (specialized procedures in these sub-specialties are performed by the members of the respective Divisions). By virtue of additional training and extensive experience the General Surgeons in this Division provide specialized Trauma and Critical Care to surgical patients.

Dan A. Galvan, M.D., F.A.C.S.


Associate Professor and Regional Chairman

Critical Care/Trauma

Dr. Dan Galvan returned to the Texas Tech University Health Sciences Center (TTUHSC) in September of 2012 as Associate Professor and Chairman of the Department of Surgery.

Dr. Galvan is a graduate of Texas A&M University and the University of Texas Medical Branch in Galveston.  His post-doctoral education included a General Surgery Residency at St. Joseph Hospital in Houston and a fellowship in Surgical Critical Care at the University of Pittsburgh Medical Center.  He was in private practice for several years in Texas prior to joining Texas Tech’s Department of Surgery at Amarillo from 2000 to 2005.  After completing a fellowship at University of Pittsburgh Medical Center in 2006, he joined the faculty at the Penn State Hershey Medical Center where he was an Assistant Professor in the division of Trauma, Acute Care and Critical Care Surgery until his return to Texas Tech.

Dr. Galvan is board certified by the American Board of Surgery with additional qualifications in Critical Care.  He is completing his Masters in Health Profession Education at the University of Illinois at Chicago.  He has served in many roles as an educator and has received numerous honors and awards in teaching. 

M. Haris Nazim, MD


Assistant Professor of Surgery

Division of Acute Care Surgery and Trauma

Trauma Medical Director, Northwest Texas Health Care System

M. Haris Nazim, MD is an American Board Certified Surgeon with added qualifications in Advanced Wound care, Hyperbaric Oxygen therapy, Burn and Reconstructive Surgery and is certified in Advanced Cardiac / Trauma and Burn Life Support. He was recruited by Texas Tech University Health Sciences Center in Amarillo as a Medical Educator and Clinician in Trauma and Acute Care Surgery in 2011 As the Trauma Medical Director at North West Texas Healthcare System; he oversees the quality of the trauma Program.  This is accomplished through a collaborative relationship with the Trauma Services Department, Nursing Administration and the relevant Medical Staff. This program is amongst the top 10 percent in the country for quality of care according to National Trauma Databank standards.  The success of the trauma program has led to Dr. Nazim to continue efforts towards building a burn program in the area which would be an asset to the community.  His other interests include elective general surgery, advanced wound care, acute care surgery and trauma / critical care.


John P. Schnatz, FNP-C, CCRN, MSN


Surgery Faculty Associate

John Schnatz, FNP-C joined as Faculty Associate in the Department of Surgery in 2011. He graduated from the College of St. Mary's, in Omaha, Nebraska with his undergraduate degree. He attended West Texas A&M University in Canyon, Texas, where he received his BSN and MSN degrees. He continued his training in Taos, New Mexico where he received his certification in First Assist in Surgery. Mr. Schnatz also received his critical care registered nurse certificate in 1984. In his spare time he spends time with his wife and two children. He also enjoys participating in triathlons and completed his first Ironman competition in 2012.

Division of Surgical Oncology:

By virtue of their advanced and specialized training beyond General Surgery, surgeons in the Division of Surgical Oncology provide diagnosis and surgical management of patients with initial, complex, recurrent or advanced malignant disease. The performance of surgery on these patients encompasses the entire spectrum of organs and body systems, to include the head and neck, thorax, abdomen, skin and skin structure, and all soft issue to include the breast. The management of malignant disease of the neurological system (brain, spinal cord and peripheral nerves) and the eye is excluded from the purview of these surgeons. Although certified in General Surgery, these Oncologic Surgeons do not as a routine perform elective General Surgery procedures.


Subhasis Misra, MD, MS, FACCWS, FACS


Associate Professor

Division of Surgical Oncology

Chief, Gastrointestinal and Hepato-Pancreato-Biliary Surgery

Subhasis Misra, MD is board certified by the American Board of Surgery and is also a Fellow of the American College of Certified Wound Specialists.  He brings with him significant expertise in providing comprehensive cancer care.   Dr. Misra performs advanced surgery for cancers of the liver, pancreas, esophagus, stomach, and colon, including hyperthermic intraperitoneal chemotherapy and robotic procedures, as well as surgery for other diseases of the gastrointestinal tract. Additionally he performs complex surgical procedures to treat breast cancer, sarcoma, melanoma, and endocrine tumors.  Dr. Misra earned his medical degree in India. He completed a general surgery internship at Rush University Medical Center in Chicago, Illinois, and a general surgery residency at Fairview Hospital/Cleveland Clinic in Cleveland, Ohio where he served as the Chief Resident.  Dr. Misra then completed a surgical oncology fellowship at the University of Miami/ Jackson Memorial Hospital in Miami, Florida. He additionally holds a master’s degree in health systems management from Rush University in Chicago.  Dr. Misra has been published extensively in peer reviewed journals and has also presented at numerous clinical conferences.   He enjoys a busy life with his wife and their beautiful little girl. During his spare time, Dr. Misra enjoys reading and sports, and has a passion for quality improvement, leadership and understanding human behavior. 

Iza Obokhare, M.D Assistant Professor 


LaJohn Quigly, M.D. Assistant Professor


Rober Gutierrez, FNP Faculty Associate 


Nathan Hansen, M.D. - Associate Professor 



Shane Harper, PA Faculty Associate 


Daren Peterson, M.D. Associate Professor 


Alan Sbar, M.D. Associate Professor 


Kendra Williams, FNP Faculty Associate 


Division of Otolaryngology:

Otolaryngologists provide comprehensive medical and surgical care to patients with diseases and disorders that affect the ears, the respiratory and upper alimentary systems and related structures of the head and neck. The care rendered by this Division is focused primarily on children who present with these conditions. A limited number of adults are accommodated by our current single specialist.

William P. Hale, M.D., F.A.C.S.

Clinical Professor of Surgery

William P. Hale, M.D. joined Texas Tech in 1977 as Assistant Clinical Professor while still in private practice.  He graduated from the University Of Louisville School Of Medicine, Louisville, Kentucky in 1958.  Dr Hale was the first to finish Otolaryngology at Parkland Hospital in Dallas 1962.  He came to Amarillo following his residency to open a private practice; later when he retired from private practice he joined Texas Tech as Professor in 2001.  Dr Hale is board certified with the American Board of Otolaryngology.  Dr Hale enjoys mentoring medical students and residents.  Outside of the office Dr Hale appreciates photography, travel, and history.