SUN RESEARCH
INSTITUTE

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427 9th St
San Antonio, TX 78215
210-227-1289



​Ernesto Guerra, M.D.
Gastroenterologist
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Desh Sharma, M.D.
Gastroenterologist
Nina De Los Santos, M.A
Patient Recruiter
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Marlon Quinines, M.D.
Psychiatrist
Lama Hashish, MD
Rheumatologist
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Guadalupe Arambula, RT
Clinical Research Coordinator
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Richard C. Garcia , LVN
Nurse
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Clifton White , LVN
Nurse
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Melissa Mageno, M.A, CRC
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Clinical Research Coordinator
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​Raudel Arias, CRC
Clinical Research Coordinator
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Mariana Reyna
Research Assistant
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OUR STAFF
Carl E. Dukes, M.D, F.A.C.P,
Internal Medicine and Nephrologist
Principle Investigator
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Robert G. Bass, M.D.
Internal Medicine
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Thomas W. Grabow, M.D.
Ophthalmologist
Sub-Investigator
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Hector L. Nevarez, M.D
Ophthalmologist
Sub- Investigator
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Izaac A. Zoch, M.D
Anesthesiologist
Sub- Investigator
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John J. Nava, M.D
Internal Medicine
Sub- Investigator
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Beneta Parthiban M.S. , CCRC
Site Director/ Regulatory Manager
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Connie Lerma, AAS
Budgets, Accounting, Contracts
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Jaspreet Kaur,
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Accounting
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Dr. Leonel Reyes is board certified in Internal Medicine. He graduated from University of Texas Health Science Center at San Antonio and is dedicated to the advancement of the Pharmaceutical and Biotechnical industry through clinical research. Under his guidance we at Sun Research Institute have a proven track record for multi therapeutic areas including device trials, asthma, allergies for adults/children and various other trials at any one time.
Dr Reyes has served as lead investigator for clinical studies relating to all of the following conditions:

Get Paid For Clinical Trial Studies

Free Medical Treatment
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IBS
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RA
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Gout
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Constipation
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Neuropathy
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Heart Burn
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Lupus
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Lyme Disease
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Gastroparesis
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NASH
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Obesity
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Crohns
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Migraine
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Diabetes Type 2
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COVID
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GERD
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Asthma
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Hypertension
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Anemia
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Influenza
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Seasonal Allergies
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Osteoporosis
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Osteo Arthritis
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COPD
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Pain
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UTI
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Cardiovascular Disease​​
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Chronic Kidney Disease
