Jessica Chang, Ph.D

Associate Director of Research

Dr. Chang works on HCCI’s data infrastructure efforts and focuses on flagship products, such as the Health Care Cost and Utilization Report. An expert in commercial claims, her research interests focus on health care competition, health policy, and behavioral economics. Prior to HCCI, Jessica worked at OptumLabs as a senior analyst, where she worked on research projects and programmed analytical datasets from a large administrative claims data warehouse. She has published numerous peer-reviewed papers on 340B, commercial prices, and physician-administered drugs.

Jessica received her BAs in Economics and International Relations and an MA in Economics from Boston University. She received her PhD in Health Services Research, Policy and Administration with a concentration in Economics at University of Minnesota School of Public Health.

A native of Honolulu, Jessica enjoys her annual winter trips home to escape the winters on the mainland. She enjoys biking, traveling and cooking.

John Hargraves, MPP

Director of Data Strategy

Mr. Hargraves oversees HCCI’s multi-payer commercial claims dataset. An expert in commercial claims, he is responsible for developing and implementing HCCI’s data infrastructure strategy, including the architecture of the HCCI dataset. He also oversees the organization’s data privacy, security, and de-identification activities. His research focuses on the impact of policy and regulatory changes on health care spending and service use, and he often collaborates with media outlets to help tell stories with data. Prior to joining HCCI, Mr. Hargraves worked as a researcher at the Centers for Medicare and Medicaid Services studying geographic variation, chronic conditions, and hospice using Medicare claims data.

John received his BS in Economics from Binghamton University and his MPP with a concentration in Program Evaluation from the George Washington University.

John is an avid outdoorsman, comic convention nerd, and TV enthusiast.

Linsay Sarfo

Associate

Ms. Sarfo supports projects across HCCI assisting with each stage of the research process. She also works with external researchers to license HCCI data. Linsay recently graduated from American University with a BA in Public Health on the pre-med track, where her capstone project focused on environmental health impacts on children in the DC area. Her interests include maternal and child health and health equity.

In her free time, Linsay enjoys visiting her family and trying out new restaurants in New York City. She also enjoys traveling and painting.

Tanya Natwick

Associate Director of Data Strategy

Ms. Natwick supports projects across HCCI with a focus on data analytics and programming. With experience in both commercial and Medicare Fee-For-Service claims, she is interested in health economics and outcomes research, maternal health, and health policy. Prior to HCCI, Tanya worked at OptumLabs as a lead research analyst where she supported research projects and programmed analytical datasets from a large administrative claims data warehouse. Previously, she was a biostatistician for the Chronic Disease Research Group. Tanya received her BA in chemistry and mathematics with a concentration in statistics from Saint Olaf College.

Outside of work, Tanya likes hiking and eating pizza with her husband and dog. She also enjoys spending time outside gardening with her chickens.