Caitlin Stewart is a Postdoctoral Research Fellow in the Tsui Lab. She is working on optimizing methods for sequencing cell–free (cf) nucleic acids and the development of cfDNA assays for use in the clinic. She is particularly interested in understanding the underlying biology of cfDNA and exploring ways we can use this understanding to improve assays and ultimately, patient care. Caitlin did her PhD at the Wellcome Trust Sanger Institute, focusing on transcriptomics and small RNA and is using her knowledge of RNA methodology to evaluate the feasibility of purifying and analyzing cfRNA.