Vera Moulton Wall Center


Clinical Team

Juliana LiuJuliana Liu, RN, MSN, ANP

Nurse Practitioner,
Adult Pulmonary Hypertension Service at Stanford
(650) 724-7261
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Juliana received her MSN from the University of California, San Francisco, where she completed both her registered nursing as well as her adult nurse practitioner training. She also has a bachelors of arts in Modern East Asian History from Pomona College in Claremont, California. She transitioned to the healthcare field after volunteer work in developing nations such as a clinic located in the slums of Nairobi, Kenya. Throughout her nurse practitioner training and immediately afterwards, she worked as a cardiac nurse in the acute care setting, where she developed an interest in cardiopulmonary diseases.   Her primary duties at Stanford involve management of pulmonary hypertension patients, physician, nursing and patient education, and serving as a liaison between various interdisciplinary teams caring for PH patients at Stanford as well as in the local community.  She has served as interim chair of the Research and Publications Committee for the Pulmonary Hypertension Resource Network.  She has presented on various topics around caring for the pulmonary hypertension patient both nationally as well as in Tokyo, Japan.

Juliana was born in Hong Kong, and grew up in Tokyo, Japan. She speaks Japanese fluently and has aural comprehension of Mandarin Chinese. She hopes that she can play a role in impacting clinical practice and research for pulmonary hypertension patients worldwide.

Michelle OgawaMichelle Ogawa, RN, CPNP-AC

Pediatric Nurse Practitioner,
Pediatric Cardiology
(650) 725-6538
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Michelle Ogawa, RN, PNP is the pediatric nurse practitioner for the Vera Moulton Wall Center for Pulmonary Vascular Disease.

After completing a B.A. in Neuroscience from Pomona College, she received her Bachelor’s and Master’s degree in Nursing at the University of Pennsylvania. During her graduate studies in pediatric critical care, she worked at the Children’s Hospital of Philadelphia for over two years as a bedside nurse in the pediatric intensive care unit (PICU). Most recently, she returned to her native home in the Bay Area, to briefly work in the PICU at Lucile Packard Children’s Hospital before starting her position as the pediatric pulmonary hypertension nurse practitioner in January 2006.

Michelle was first inspired to pursue a nursing career in pediatrics while working with developmentally disabled children in a rehabilitation center during her undergraduate studies. Since then, she continues to find her work caring for pediatric patients with complex medical challenges and their families to be a rewarding and gratifying experience.

Allyson RuppAllyson Rupp, LCSW

Social Worker
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Allyson Rupp, LCSW, is the Wall Center’s licensed clinical social worker for the adult PH service. She performs psychosocial assessments for patients, supports families through the diagnosis and education of PH and its treatments, finds resources to assist patients through crisis, and focuses on encouraging patients and their families to develop the tools and resources to adjust to a PH diagnosis. She facilitates the monthly PH support group for patients and their support persons, and is a member of the PH Resource Network though the PHA.

Allyson earned her master’s degree in social work (MSW) from the University of California, Berkeley. She completed her clinical social work training at the Golden Gate Regional Center, and in the Pediatric Liver Transplant Program at Lucile Packard Children’s Hospital. Allyson was the clinical social worker for both the adult PH program and the heart/lung transplant program until 2007, when she transitioned to focusing primarily on the PH program. Prior to joining the Wall Center in 2003, Allyson held social work positions in the cardiac/critical care units and emergency rooms at two alternate medical centers.

In addition, Allyson has given presentations on several topics at conferences held in Miami, Florida; Tokyo, Japan; Garden Grove, CA; and San Francisco, California. These topics include adjusting to chronic illness and managing post-transplant issues, such as intimacy, quality of life, and psychosocial treatment. She is honored to be invited routinely to lead support groups at the PHA’s international conference and the California-based PH Forum. She is particularly interested in the impact of chronic illness on individual and family systems; the development of solid, sustainable support resources for patients and their families; identifying and helping to prevent intimate partner abuse; the impacts of drugs on psychosocial stability; and the equitable distribution of healthcare resources.

Allyson currently resides in San Francisco—the home of her lifelong favorite Giants baseball team—with her two sons and husband, and enjoys baking, writing, running and kayaking.

Allyson RuppTamzen Hull, MSW

Pediatric Social Worker
(650) 725-9626
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Tamzen Hull, MSW, is one of the Wall Center’s clinical social workers for the pediatric patients.


Val ScottVal Scott, RN, MSN

Clinical Research Nurse
(650) 725-8082
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Val Scott, RN, MSN, was born in Scotland and received a Diploma of Nursing and an ICU certification from Glasgow Royal Infirmary in Glasgow, Scotland. She moved to the United States twenty years ago and fell in love with California. After years of clinical nursing, including 10 years in critical care, she moved to clinical research in 1990. She has worked at Stanford coordinating pulmonary hypertension clinical trials since early 1998. She is the coordinator of the Association of Clinical Research Nurses.

Drew HsiDrew Hsi

Social Science Research Assistant
(650) 721-3080
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Drew Hsi manages the PH Database for the Vera Moulton Wall Center and assists with clinical research on adult PH patients.  His responsibilities include abstracting and preparing data for research studies, and assisting with clinical trial coordination.

Drew received his B.S. in Electrical Engineering and Computer Sciences from the University of California, Berkeley.  He worked many years at Hewlett Packard Company as an information technology engineer before deciding to leave to begin a new career in healthcare.


Dawn MaxeyKeeley Phillips

Clinical Research Coordinator
(650) 723-8922
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Keeley Phillips is the Pediatric Clinical Research Coordinator for the Vera Moulton Wall Center for Pulmonary Vascular Disease. She is responsible for managing pediatric research in PH such as the Pulmonary Hypertension Database, TOPP (Tracking Outcomes and Practice in Pediatric PH), and Ambrisentan drug trials at LPCH.

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