About Allianz Research Institute

About Us

David N. Pham, M.D., F.C.C.P.

Dr. David Pham is the founder of the clinic and research program, bringing nearly 30 years of experience in pulmonary medicine, internal medicine, and clinical research. After moving from Vietnam to Huntington Beach as a child, he went on to study Biological Sciences at the University of California, Irvine, before earning his medical degree from the University of Maryland School of Medicine.
Dr. Pham completed Internal Medicine training at Tulane University, immunology training at the National Institutes of Health, and Pulmonary and Critical Care training at the University of Colorado, with additional immunology training at Rank #1 National Jewish Health. His clinical and research work has focused on asthma, COPD, airway inflammation, and the development of new therapies for respiratory and related diseases.
As the practice enters its next chapter under the leadership of Dr. Kareem Ahmad, Dr. Pham’s foundational work continues to guide its mission of providing advanced pulmonary care, expanding clinical research, and delivering patient-centered medicine throughout Orange County.

Dr. Kareem Ahmad, M.D.

Dr. Kareem Ahmad is a board-certified Pulmonary and Critical Care physician and the Medical Director and President of Allianz Research Institute. Raised in Irvine, California, Dr. Ahmad is proud to serve the Southern California community he has long called home.
Dr. Ahmad earned his medical degree from Poznan University of Medical Sciences. He completed his Internal Medicine residency at Creighton University, followed by fellowship training in Pulmonary and Critical Care Medicine at the University of Arizona. He then pursued advanced subspecialty training in Lung Transplantation and Advanced Lung Disease at Inova Fairfax Medical Campus.
Dr. Ahmad has extensive experience caring for patients with advanced and complex respiratory conditions, including interstitial lung disease, pulmonary fibrosis, COPD, asthma, and pulmonary hypertension.
He currently serves with the U.S. Department of Veterans Affairs and as Core Faculty for the Sierra View Medical Center Internal Medicine Residency Program, where he helps train the next generation of physicians.
Following the retirement of Dr. David Pham, Dr. Ahmad has assumed leadership of Allianz Research Institute and Comprehensive Pulmonary Medical Group. Under his leadership, the organization continues its mission of providing advanced pulmonary care, expanding access to clinical research, and bringing innovative therapies to patients throughout Southern California.

Dr. Gurdeep Singh, M.D.

Dr. Gurdeep Singh grew up in California’s Central Valley and earned his medical degree from Dayanand Medical College & Hospital. He continued his medical training through the Internal Medicine residency program at Sierra View Medical Center, where he developed a strong clinical interest in pulmonary medicine.
Dr. Singh currently serves as a physician with Comprehensive Pulmonology Medical Group and as a Physician Sub-Investigator at Allianz Research Institute. His work combines direct patient care with a strong focus on evidence-based treatment and long-term disease management. At Allianz Research Institute, Dr. Singh helps support physician-led clinical trials evaluating novel therapies for asthma, COPD, pulmonary fibrosis, and other pulmonary diseases. He participates in study-related medical assessments, patient evaluation, safety monitoring, protocol implementation, and clinical oversight.
Dr. Singh is committed to advancing pulmonary care through both clinical medicine and research to improve outcomes for individuals living with chronic lung disease.

Marlyn Rodriguez

Marlyn Rodriguez is the Senior Clinical Research Coordinator with over two years of experience supporting and managing clinical research studies across a variety of therapeutic areas. She plays an integral role in the coordination of clinical trials, helping ensure that studies are conducted efficiently, ethically, and in compliance with regulatory standards while maintaining a strong focus on participant safety and data integrity.
Prior to entering the clinical research field, Marlyn spent more than a decade working in mental health and addiction services. Marlyn is passionate about advancing medical research and contributing to the development of innovative therapies that have the potential to improve and transform patients' lives. She is dedicated to supporting both study participants and investigators throughout the research process and takes pride in helping bring new treatment options closer to the patients who need them most.

Silva Santiago

Silvia Lopez de Santiago earned her medical degree in Mexico and has experience in patient care, clinical medicine, and healthcare education. Her background in medicine has provided her with a strong understanding of patient-centered care, clinical decision-making, and healthcare delivery.
She currently serves as a Clinical Research Coordinator, where she supports the management and execution of clinical trials while working closely with investigators, study participants, and research teams. Her responsibilities include coordinating study activities, ensuring protocol compliance, and helping maintain the highest standards of patient safety and data quality.
Drawing from both her medical training and research experience, Silvia is passionate about improving patient outcomes through a combination of clinical excellence, scientific inquiry, and compassionate care.

We are conducting clinical trials. To find out more contact us.

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