Principal Investigator

Diana Hargreaves
Principal Investigator
Research Associates

Nasiha Ahmed
Research Associate
Salk Cancer Center T32 Postdoctoral Fellow

Helen McRae
Research Associate
Salk Postdoctoral Fellow
Tang Prize Awardee
CRI Irvington Postdoctoral Fellow
Research Assistants

Visiting Researcher
Graduate Students

Brent Chick
Graduate Student
UCSD T32 Pathways in Biological Science (PiBS) Predoctoral Trainee
Mary K. Chapman Foundation Awardee

Shitian (Steven) Li
Graduate Student
Steven grew up in Hunan, China, and moved to the United States in 2016 to pursue higher education. He graduated cum laude from UCSD with dual BS degrees in Bioengineering and Mathematics. As an undergraduate, he conducted research in the labs of Drs. Yingxiao (Peter) Wang and Stephanie Fraley, working on biosensor development and computational image analysis. After graduation, he joined Dr. Crystal Zhao’s laboratory at Sanford Burnham Prebys, where he studied the regulation and function of RNA m6A modifications.
Steven returned to UCSD in 2021 to pursue his PhD in Biological Sciences and joined the Hargreaves lab at the Salk Institute in 2022. His doctoral research investigates how disruption of SWI/SNF (BAF) chromatin-remodeling complexes alters tumor–immune interactions, interferon signaling, and responses to cancer immunotherapy. His work has also explored therapeutic vulnerabilities arising from the interplay between chromatin remodeling and oncogenic signaling in pancreatic cancer. In 2026, he joined Genentech Research Oncology as a PhD intern, where he studied treatment-induced cell-state plasticity and therapeutic vulnerabilities in colorectal cancer.
Outside the lab, Steven enjoys cooking—especially Hunan cuisine and Italian/Japanese fusion—travel and aviation, musical theatre, and discovering good food and wine.

Hannah Rattu Mandias
Graduate Student
UCSD T32 Predoctoral trainee
NIH F31 Predoctoral Fellow


Samuel Rivera
Graduate Student
Student Trainee
