Our Team



Raven David, MPH, CHTS-PW is the Project Manager for HI-FIVE, based in the Department of Biomedical Informatics at Columbia University.  She has over 10 years of experience in healthcare administration, research, data management, and quality improvement. Raven previously worked at the Leonard Davis Institute for Health Economics at the University of Pennsylvania, Baltimore City Health Department, and New York State Psychiatric Institute. Raven studied public health, urban studies, and sociology at the University of Pennsylvania and received her MPH in healthcare management and a certificate in health informatics from Columbia University. When not working, Raven enjoys interior design, watching history documentaries, and spending time with her English bulldog, Hudson.


Jennifer Ringler is an Assistant Project Manager at HI-FIVE, supporting program operations and strategic planning. She is a Master of Health Administration student at Columbia University’s Mailman School of Public Health. Prior to joining the HI-FIVE team, Jennifer managed a Type 1 diabetes and pancreatic cancer laboratory at the University of California, San Francisco and studied Molecular Biology at the University of California, Berkeley. In her free time, Jennifer loves baking, running (to counteract the baking), and playing the flute.


Daniela Lopez is the Engagement Manager at HI-FIVE, where she manages all social media relations. She is currently an MPH candidate in the department of Health Policy and Management, with a concentration in Public Health Informatics at the Columbia University Mailman School of Public Health. Her experience is as a public servant in both local and school governments, particularly in the field of health policy. Before she joined HI-FIVE, she volunteered at the Bronx High School of Science and with the NYC Department of Education where she served as a mentor to high school students. When Daniela is not at HI-FIVE, she runs by the Hudson River or searches for restaurants to explore in NYC – Korean BBQ always being her top choice!


Matthew Zhou is the Data Manager for HI-FIVE, coordinating database pipelines and creating automation tools. He is a second year MPH student at the Columbia University Mailman School of Public Health where he studies data science and health policy. Matthew is a graduate of Northwestern University where he studied statistics and anthropology and spent time working in international development M&E programs for GlobeMed, a non-profit consulting network.


Lexie Xinyi Deng is the Manager of Course and Instructional Design at HI-FIVE and oversees course management and improvement. She is a Master’s Candidate at Columbia University Teachers College majoring in Instructional Technology and Media. She has academic backgrounds both in instructional design and digital media technology and has a special understanding of utilizing technology in course design and classroom management. As a lover of music and digital media, Lexie enjoys creating musical scores and making them into real music.


Yao Chen is the Manager of Course and Instructional Design at HI-FIVE. She is a first-year graduate student in Instructional Technology and Media program at Columbia University Teachers College. Currently, she focuses on gamification to enhance the learner experience. In addition to instructional design, Yao specializes in web development and android development.


Arun Kalyanasundaram is a Business Consultant to the HI-FIVE team and an Executive MBA candidate at the Columbia Business School. Arun received his Bachelor’s degree in information technology from Anna University and currently provides consulting advisory service within contracting and pricing in the pharmaceutical industry. Arun has over 12 years of experience working in pharmacovigilance, sales and marketing, and technology projects for global implementation. Arun likes running, ice skating and movies. In addition to school, Arun is excited to work in machine learning and ideas for startups.