Areli Balderrama

Policy and Program Analyst

Areli Balderrama is a Policy and Program Analyst at SafeTREC. They hold a BA in Comparative Literature, a minor in Black Studies from UC Santa Barbara, and a Master of Public Health + a Master of Urban and Regional Planning from the University of Michigan. Through their experience in data visualization, policy and research, they will support projects that promote healthier and safer communities.

Ipsita Banerjee

Research Data Analyst
Ipsita Banerjee is a transport planner with interests in sustainability, transit research, and travel demand analysis. She has worked at SafeTREC as a graduate student researcher and as a policy and program analyst. In her present role as Research Data Analyst, she works on Caltrans’s project on Safe Systems Research and Implementation. Outside of SafeTREC, she has led efforts on travel demand analysis of Electronics City commuters, and ridership prediction for a transit authority, both for the city of Bangalore, India. She was also a lecturer at UC Berkeley, teaching the graduate course on...

Jeffrey Chang

Research Administrator

Jeffrey Chang is a Research Administrator at the Safe Transportation Research and Education Center (SafeTREC). He assists the Finance Manager in administering SafeTREC's finances and also works with research staff to help coordinate project activities. He started working at SafeTREC as a student assistant, and after receiving his degree in Molecular and Cell Biology at UC Berkeley, joined SafeTREC full-time.

Katherine L. Chen

Senior Policy & Program Analyst

Katherine Chen is a Senior Policy & Program Analyst at SafeTREC where she coordinates multidisciplinary transportation injury prevention planning and research. She manages the Community Pedestrian and Bicycle Safety Program (CPBSP) as well as projects involving active transportation, teen driver safety, community-level safety planning, and statewide highway safety planning.

Previously, Katherine coordinated public health research with community health centers and served as an Emerson National Hunger Fellow. She received her BA in Public Health from UC Berkeley and MPP from the...

Jill F. Cooper


Jill Cooper is the Co-Director of the UC Berkeley Safe Transportation Research and Education Center (SafeTREC). She facilitates multi-disciplinary traffic safety and injury prevention planning. She is the principal investigator on projects involving pedestrian and bicycle safety, crowdsourced data collection, community-level safety planning, and statewide highway safety planning.

Jill has also served as a mediator, and has taught mediation and negotiation at several universities. She received a Masters degree in Social Welfare from UC Berkeley.

Read Jill Cooper's...

Jarah Crowner

Policy & Program Analyst

At SafeTREC, Jarah coordinates Street Story: a community engagement platform that collects information about transportation collisions, near-misses, hazards, or safe places to travel. She provides technical assistance to organizations and agencies on how to use the tool within the communities they serve. Jarah also serves as support staff for the Community Pedestrian and Bicycle Safety Training program.

Previously, Jarah worked as a Biorepository Specialist at the University of Mississippi Medical Center. In this capacity, she collected health information, blood specimens and...

Garrett Fortin

Policy & Program Analyst

Garrett Fortin is a Policy & Program Analyst at the UC Berkeley Safe Transportation Research and Education Center (SafeTREC). He designs and implements active transportation safety programs and supports traffic safety projects via data analysis at the local and state levels.

Previously, Garrett worked as an Americorps VISTA in San Jose with a college access nonprofit. He received a Masters degree in Social Policy from the University of Pennsylvania.

Liwei Fu

Applications Programmer

Liwei Fu is the Applications Programmer at SafeTREC. She works on taking a data-driven approach to help resolve traffic safety issues. She is involved in building crowdsourced data tools, tribal data analysis, and various other traffic injury mapping tools. She has experience in data management and statistical models, and works with time series and spatial data.

Offer Grembek


Dr. Offer Grembek is a researcher and lecturer at the University of California Berkeley. He serves as the Co‐Director at the university’s Safe Transportation Research and Education Center (SafeTREC), a research center affiliated with the UC Berkeley School of Public Health and the UC Berkeley Institute of Transportation Studies. Dr. Grembek is a member of the California Strategic Highway Safety Plan Steering Committee and the Transportation Research Board Committee on Transportation Safety Management Systems (ACS10). As a Principal Investigator, Dr. Grembek has obtained multiple sponsored...

Julia B. Griswold


Julia is a researcher at SafeTREC and serves as technical lead on projects related to bicyclist and pedestrian safety. Her research expertise and interests include collection and processing of nonmotorized transportation data, bicyclist and pedestrian and exposure modeling, improving access to safety data, and bicyclist level of service measures.

Julia developed her first pedestrian exposure model for her master's thesis in Geography at San Francisco State in 2006. She began working at SafeTREC as a graduate student researcher in 2009, continued as a postdoctoral scholar after...