Meet Our Team

Learn more about the experts working in our Molecular Determinants Core

David Graham, Ph.D.


Dr. Graham is the director of the Johns Hopkins All Children’s Molecular Determinants Core (previously known as the Center for Resources in Integrative Biology). Additionally, Dr. Graham is an Associate Professor of Anesthesiology and Critical Care Medicine.

Dr. Graham has extensive experience in the biological applications of mass spectrometry in the areas of proteomics, metabolomics, lipidomics and peptidomics. His research interests include understanding the consequences of HIV interactions with the immune system, the resulting pathogenesis in the periphery and the central nervous system, and the development of potential therapeutics. He applies advanced technologies like mass spectrometry to dissect processes at the molecular level. He is also actively involved in cancer and cardiovascular research examining the impact of disease at a molecular level.

Dr. Graham earned his undergraduate degree in biomedical and health sciences at the University of Guelph, and his master's degree in biology at McMaster University, both in Ontario, Canada. He earned his Ph.D. in biochemistry, cellular and molecular biology at Johns Hopkins University.

David Graham, Ph.D.,  the director of the Johns Hopkins All Children’s Molecular Determinants Core.

Susan Aja Ph.D.

Client Lead

Dr. Aja brings broad experience in project management and metabolism-related research to her role as Client Liaison for the Molecular Determinants Core. She earned her BS and PhD in Physiology at University of California at Davis, conducted postdoctoral training at the Johns Hopkins University School of Medicine, and has been JHUSOM faculty since 2002. Her own research interests have been CNS and peripheral neurotransmitters, neuropeptides, amp-activated protein kinase, fatty acid metabolism modulation, and TCA-cycle/mitochondrial health in the regulation of energy balance in metabolic health and disease. Prior to joining MDC in 2015, she established and has run a university service core for in vivo rodent metabolic services since 2008. Dr. Aja is committed to guiding researchers to optimal resources and expertise, and coordinating projects to successful outcomes.

Susan Aja Ph.D.,

Robert Harlan M.S., C(ASCP)CM

Operation and LCMS Lead

Rob Harlan’s interests include metabolomics profiling, targeted assay development, and clinical mass spectrometry. He has over twelve years of experience in targeted assay development using multiple reaction monitoring (MRM) assays for LC-MS/MS for high-throughput quantification of small molecule metabolites and peptides. He also has experience in clinical mass spectrometry, is a board certified medical technologist, and has experience in clinical method development in the area of clinical chemistry. Robert earned his master’s degree from Michigan State University and began his mass spectrometry research developing clinical LC-MS/MS methods for therapeutic drug monitoring at Johns Hopkins Hospital.

Robert Harlan M.S., C(ASCP)CM, Operation and LCMS Lead at Johns Hopkins Hospital.

Aurelie Roux, Ph.D.

Quality and Development Lead

Dr. Roux is a Pharmacist and has a PhD in analytical chemistry with over 10 years of experience in mass spectrometry and translational research in both industrial and academic settings. She earned her M.Sc & Pharm.D in Quality Control and Analytical Development at University Paris V and her second M.Sc & Ph.D in Analytical and Theoretical Chemistry at University Paris VI. She conducted her postdoctoral training at the National Institutes of Health, and joined Johns Hopkins All Children’s Hospital in 2015. She has vast expertise in LC/MS, mass spectrometry imaging, molecule identification by MS/MS, statistical analysis, analytical development and quality control (GLP). Dr. Roux brings new meaning to the terms creative and meticulous. She is a problem solver with astounding organizational skills.

Aurelie Roux, Ph.D., Quality and Development Lead at ohns Hopkins All Children’s Hospital.

Greg Ellis


Dr. Ellis has interests spanning a wide range of analytical problems in biochemistry and environmental chemistry. He has ten years of experience in triple-quadrupole GC-MS for the analysis of human and animal metabolites and environmental contaminants. He also has expertise in multivariate statistical analysis, database design/implementation, and scientific computing in Python, SQL and R. He received his master’s in biological oceanography from the University Of Rhode Island Graduate School Of Oceanography and his PhD in chemical oceanography from the University of South Florida.

Greg Ellis, GCMS Lead