Current Lab Members

From left to right, Sarah, Sammi, Leela and George

George P. Souroullas, PhD

Principal Investigator

George completed his PhD thesis in the Goodell Lab at Baylor College of Medicine, Houston TX, in the Department of Molecular and Human Genetics.  At Baylor, George studied various molecular and genetic pathways involved in regulating hematopoietic stem cell self renewal and differentiation.  He then completed postdoctoral work at UNC-Chapel Hill in the lab of Norman (Ned) Sharpless.  In the Sharpless Lab, George generated a number of genetically engineered mouse models to explore a broad range of topics in cancer biology, eventually focusing his efforts on studying the role of epigenetic and chromatin regulation in lymphoma and melanoma.  George joined the Division of Oncology as an Assistant Professor at Washington University School of Medicine in St. Louis in July of 2018.In his free time, George enjoys running,  the outdoors, the beach and hanging out with his young and growing family!


Sarah Zimmerman, PhD

Postdoctoral Research Associate

Sarah joined the lab in December 2018. She completed her PhD training at the University of Arkansas for Medical Sciences in the lab of Roy Morello. In her spare time, she enjoys exploring the city, knitting, and spending time with her dog.


Samantha Nixon

Research Technician II

Samantha joined the lab in June 2018.  She completed her Bachelors in Chemistry and Microbiology at the University of Wisconsin-Oshkosh and moved to St. Louis and WashU because of the many opportunities the city and university offer. Outside of lab, Samantha likes to go on hikes with her dog and try all of the different types of food in the city.


Chuck Norris

Super Black Belt Tech

After a long career in the martial arts, Chuck decided to focus his attention in curing cancer.  Rumor has it that his tears could cure cancer, but he never cried.  Currently, Chuck is trying to understand how mutations in chromatin modifiers drive uncontrolled tumor growth.  However, every time Chuck opens the incubator, the cells are scared to death.  Chuck is trying to understand the underlying mechanism of that unusual behavior…


Leela Raj

Undergraduate researcher,
Washington University in St. Louis


Jack Zhang

Undergraduate researcher
Washington University in St. Louis


Administrative Support

Matt  Luecke

Molecular Oncology

Grants Specialist, Administrative Support

Incoming DBBS graduate students…


this could be you here!


or here!

Lab Alumni


Gejae Jeffers – Rotating Graduate Student, DBBS, MGG Program
Rachel Paolini – Rotating Graduate Student, DBBS, MGG Program
Jessica Harrison – Rotating Graduate Student, DBBS, HSG Program
Kent Lin – Rotating Graduate Student, DBBS, MCB Program
Maksim Shoykhet – Undergraduate, Washington University in St. Louis
Laura Fischer – Rotating Graduate Student, DBBS, DRSC Program