Lab Members


Principal Investigator
Gillian Barlow, PhD
Project Scientist

Gillian Barlow, PhD, is a project scientist for the Medically Associated Science and Technology (MAST) Program at Cedars-Sinai. She obtained her bachelor of science from Dublin City University in Ireland, where she majored in genetics and immunology, and subsequently earned her doctorate in molecular biology from University College Dublin. Her fields of expertise include molecular biology and molecular genetics, and she is highly experienced in cell culture and the generation and analysis of knockout and transgenic mouse models. Barlow’s research interests include the roles of the gut microbiome in metabolism and weight gain, and in gastrointestinal conditions such as irritable bowel syndrome. Prior to joining the GI Motility Program, she was a research scientist in the Division of Molecular Neurogenetics (Department of Pediatrics) at Cedars-Sinai. There she worked on the molecular genetics of Down syndrome, and later worked in the Division of Reproductive Endocrinology and Infertility (Department of Obstetrics and Gynecology), where she worked on female infertility and premature ovarian failure. Barlow has held grants from the American Heart Association and has been a co-investigator on grants from the Eunice Kennedy Shriver National Institute of Child Health and Human Development. To date, she has co-authored more than 30 peer-reviewed papers and five book chapters.

Stacy Weitsman, MS
Laboratory Director

Stacy Weitsman earned her bachelor of science from Indiana University and her master of science from the University of California, Riverside. She has more than 30 years of experience in research with 20 years in laboratory management. Weitsman has co-authored more than 80 peer-reviewed journal articles and abstracts. She currently works on the rifaximin study for the Valeant grant and the polycystic ovary syndrome androgens study in the laboratory. Her responsibilities include overseeing basic science operations and interfacing with the research and administrative teams.

Walter Morales
Laboratory Supervisor

Walter Morales graduated from UCLA where he studied microbiology, molecular genetics and immunology. He is primarily responsible for the rifaximin study for the Valeant grant.

Gabriela Leite, PhD, MS
Research Associate III

Gabriela Leite, PhD, earned her bachelor's degree in pharmacy and clinical analysis and her master's degree in health science from State University of Maringa in Brazil. She also received her doctorate in science from University of Sao Paulo, Brazil. Leite’s research interests are the interrelationship between the gut microbiome and gastrointestinal conditions, such as irritable bowel syndrome, small intestinal bacterial overgrowth and the interdependence of the gut microbiome and metabolism. Her current work for the laboratory includes the microbiome analyses for the methane and obesity study.

Rashin Sedighi, PhD, MS, RN
Research Nurse

Rashin Sedighi, PhD, MS, RN, earned her bachelor's degree in nursing from Shahid Beheshti University School of Nursing, Tehran, Iran, followed by a master of science in maternal and child nutrition from University of California, Davis. She received her doctorate in nutritional and food science from North Carolina Agriculture and Technology State University in Greensboro where she focused on understanding obesity and diabetes and their complications. Her current project in the laboratory is the small intestinal microbial study.

Chandrima Chatterjee, MS
Research Administrative Coordinator

Chandrima Chatterjee has a master's degree in public health education and bachelor of science in biology. Her research interests are nutrition sciences and health education, in addition to the use of sports as a tool for combating public health issues. Chatterjee provides support with philanthropy outreach, curates Medically Associated Science and Technology (MAST) Program-related media/branding and presentations and streamlines social and digital media assets.

Shreya Celly
Research Associate I

Shreya Celly received a bachelor of science in biochemistry from the University of Southern California. Celly is working on the Valeant study and the small intestinal microbiome sampling study.

Gonzalo Parodi
Research Associate II

Gonzalo Parodi earned a bachelor of science in both biochemistry and biotechnology from California State University, Northridge. Parodi focuses on the polycystic ovary syndrome androgens study in addition to assisting with other projects in the lab.

Anasheh Enjily, MSW
Research Associate I

Anasheh Enjily earned her master of social work degree from the University of Southern California and her bachelor's degree in journalism and public relations from California State University, Northridge. Enjily performs clinical research on gut microbiome.

Contact the Mathur Lab

8700 Beverly Blvd.
Davis Building, #5009
Los Angeles, CA 90048