Lab Members

  • Abdhel Exinor

    • Undergraduate Work Study
  • Aykut Demirkol, MD

    • Postdoctoral Research Scientist
    • MD, Ege University of Izmir, Turkey, 2003

    Over the past ten years, I have dedicated my career to treating retinitis pigmentosa (RP) patients. Through my medical training and experience treating hundreds of ophthalmology patients, not only have I discoved a passion for my clinical work with patients, but I have also become increasingly devoted to genetics research in the field of inherited retinal dystrophies. Moreover, in the past three years, I have been working at the Dr. Stephen Tsang’s Lab team and continue to the research projects about RP.

  • Anders Steen Knudsen

    • PhD Candidate in Biomedical Engineering
    • BS in Biomedical Engineering, Tufts University, 2022

    I got my bachelor’s degree from Tufts University where I majored in Biomedical engineering, during which my research focus involved both cardiovascular immunology and medical devices, specifically clinical infusion pumps. Here in the Tsang lab my research focuses on developing gene therapies for inherited retinal degenerations via metabolic reprogramming and CRISPR-based tools.

  • Bruna Lopes da Costa

    • PhD Candidate in Biomedical Engineering
    • MS in Pharmaceutical Sciences, Federal University of Minas Gerais, Brazil, 2018

    I am highly motivated in translational research that will bring engineering designs to gene and protein delivery for the treatment of inherited retinal diseases. In 2018, I completed my Master’s degree in pharmaceutical sciences and during this training period I worked in several projects developing drug delivery systems for eye diseases. In September 2019, I started my PhD in the Biomedical Engineering Program at Columbia University. Since then, I have initiated projects on retinal disease modeling using iPSC derived retinal organoids, and am developing potential therapies for inherited retinal diseases, including gene-dependent and gene-independent therapeutic approaches. My long-term research aspirations are to apply genome engineering technology to treat patients suffering from genetic disorders leading to blindness.

    Bruna Lopes da La Costa
  • Georgy Komissarov

    • Laboratory Technician
    • BS in Biochemistry, Case Western Reserve University, 2023

    My name is Georgy Komissarov and I am employed as a Technician B in Dr. Tsang’s lab since August of 2024. I have graduated from CWRU in May 2023. I enjoy cooking and baking and sharing the results with the lab!

  • Hannah Hu

    • PhD Candidate in Biomedical Engineering
    • MS in Biomedical Engineering, Columbia University, 2024
    • BS in Bioengineering, California Institute of Technology, 2022

    My career goals focus on translational research and developing therapeutics that are clinically applicable, and I hope to see the work I do on the bench be directly relevant and supportive to clinical studies. My background began in genetics and synthetic biology in the Dr. Kaihang Wang lab at Caltech, pushing my interest in a gene editing approach for bioengineering and biomedical engineering studies. The desire to combine genomic perturbations with clinical relevance brought me to Dr. Stephen Tsang's lab, allowing me to experiment with in vivo models and patient-derived cell lines for translational research in genome engineering. In my free time, I enjoy spending time with my two cats and playing video games.

  • Johnathan Bailey

    • Fellow
    • MD Candidate, Columbia University, Class of 2025
    • BS in Biomedical Sciences, The University of Alabama at Birmingham, 2021

    Professionally, I serve as the clinical research fellow for Dr. Tsang. Academically, my interests lie at the intersection of socioeconomic inequities and preventable blindness. I plan to become an ophthalmologist that serves patients in underserved areas through advocacy to remediate disparate gaps in care. I am extremely grateful to Dr. Tsang for this opportunity as I strive to alleviate illness at and beyond the bedside.

  • Justin Yun

    • PhD Candidate in Biomedical Engineering
    • MS in Biomedical Engineering, Columbia University, 2024
    • BS in Biomedical Engineering, Columbia University, 2023
    • BA in Biology, Bard College, 2023

    As a student studying biomedical engineering, my interests lie in genome engineering and utilizing the tools in this field for therapeutic purposes. This interest drew me to the Tsang lab, where I now am a doctoral candidate focusing on developing treatments for inherited retinal diseases. Outside of the lab, I enjoy playing tennis, reading, and watching anime. 

  • Maximilian Kong

    • Fellow
  • Nicholas Nolan

    • PhD Candidate in Biomedical Engineering
    • MS in Biomedical Engineering, Columbia University, 2022
    • BS in Biomedical Engineering, University of Miami, 2017

    I am a fifth-year PhD candidate specializing in therapeutic gene reprogramming of the metabolome, aiming to mitigate retinal degenerations such as retinitis pigmentosa and age-related macular degeneration. My work has contributed to successfully publishing gene metabolic reprogramming efforts in the retina. Beyond my research, I enjoy engaging in various activities, including mountain biking, cooking, guitar, video games, swimming, and camping, which provide a balanced blend of creativity and adventure outside the lab.

  • Noah M. Heaps

    • Undergraduate Work Study
    • BA Candidate in Biology, Columbia College, class of 2025

    I have enjoyed spending my undergraduate years assisting Dr. Tsang in his clinical practice as an electroretinogram technician and contributing to research that focuses on the development of CRISPR therapeutics for rhodopsin retinopathies. Upon graduation from Columbia College, I hope to continue contributing to research that will help people with hereditary neurodegenerative diseases—especially those who suffer from Retinitis Pigmentosa—all over the world. A special thanks to Dr. Tsang and Salvatore M. Caruso for mentoring me in the lab and allowing me to gain hands-on laboratory experience as an undergraduate. 

  • Richard Han

    • Laboratory Technician
    • BA in Biology, Columbia University, 2024

    Working on ways to restore normal phenotype in RPE cells from Bietti's Crystalline Dystrophy patients derived from induced pluripotent stem cells. Investigating ways to replicate the disease phenotype using interactions between blue light exposure and ROS generation. 

  • Salvatore Marco Caruso

    • PhD Candidate in Biomedical Engineering
    • MS in Biomedical Engineering, Columbia University, 2022
    • BS in Chemical and Biomolecular Engineering, Johns Hopkins University, 2019

    Having previously worked in the gene therapy industry as a process engineer, I developed a deep passion for translational research and returned to Columbia University to pursue a doctorate in biomedical engineering. My interests lie at the intersection of neurodegenerative diseases and genomic medicines. As a PhD candidate in Dr. Stephen Tsang’s lab, I work on several CRISPR gene editing projects including both an allele-specific single nucleotide variant (SNV) editing approach for autosomal dominant disorders and a prime editing strategy for the correction of PRPH2 splicing mutations.

    Salvatore Marco Caruso
  • Sharifa Davis

    • PhD Candidate in Biomedical Engineering
    • MS in Biomedical Engineering, Columbia University, 2023

    After working at a cell and gene therapy start-up focused on developing adeno-associated viral therapeutics for rare diseases, I became interested in exploring translational research and returned to Columbia University to pursue a doctorate in biomedical engineering. In Dr.Stephen Tsang’s lab I focus on leveraging gene editing tools such as CRISPR to uncover pathogenic mechanisms for retinal diseases such as age-related macular degeneration (AMD) and developing potential cell therapies for retinal diseases.

    Outside of lab I enjoy going to Pilates, cooking, trying new coffee shops, and snowboarding when it’s cold out. 

  • Siyuan Liu

    • PhD Candidate in Biomedical Engineering
    • MS in Biomedical Engineering, Columbia University, 2023
    • BS in Biomedical Engineering, University of California, Davis, 2021

    Siyuan is a PhD student who joined Tsang lab in 2023, and he is working on gene/metabolic therapy for inherited retinal diseases. His academic pursuits and professional interests converge in the field of gene therapy, tissue engineering, and regenerative medicine. He is deeply passionate about advancing healthcare solutions that harness the potential of these cutting-edge technologies.

    Siyuan graduated from UC Davis with a B.S. in Biomedical Engineering in 2021, focusing on automated microscopy drug screening system for cardiotoxicity identification. He also received his M.S. degree in Biomedical Engineering at Columbia in 2023. Besides doing research, he loves doing all kinds of sport, working out, shopping, and playing video games.

  • Thomas Winogrodzki, PhD

    • Postdoctoral Research Scientist
    • PhD, Technical University of Munich, Germany, 2023
    • MS in Molecular Biotechnology, Technical University of Munich, Germany, 2019

    I focus on the inflammatory mechanisms underlying chronic diseases, using genetic techniques to develop and treat both small and large animal models. During my PhD at the Technical University of Munich, I generated the first pig model of inflammatory bowel disease by genetically modifying in vitro-derived embryos. I analyzed disease-associated microbe-host-interactions in this and other disease models using microbiomics and intestinal organoids. In the Tsang Lab, I am investigating the potential of metabolically reprogramming retinal immune cells via immunoengineering to mitigate inherited retinal degenerations.

    Outside the lab, I enjoy climbing, beatboxing, and exploring New York neighborhoods.

  • Wen-Hsuan Wu

    • Senior Staff Associate II
  • Yao (Iris) Li, MD

    • Associate Research Scientist
    • MD, Harbin Medical University, China, 2011

    My research interesting is utilizing patient-derived iPSC-RPE cells (iRPE) to establish in vitro disease modeling, underpinning the potential of customized cell and gene therapy to optimize treatment modalities for individual patients. These advances promise to enhance clinical outcomes and elevate the quality of life for individuals confronting retinal disorders. Secondly, decode the molecular intricacies of retinal diseases. With my subsequent induction into the Precision Medicine Fellowship at the Irving Institute for Clinical and Translational Research at Columbia, I have continued to infuse my acumen into precision medicine, focusing on elucidating the intricate relationships between genetic blueprints and their phenotypic manifestations. Currently, I am weaving gene-editing technology into the fabric of my research. The refinement of genome-repaired iRPE cells heralds a new chapter in the evolution of cell replacement therapies, while the advancements in both in vitro and ex vivo genome editing are poised to redefine the boundaries of gene therapy and holds the chance to significantly improve patient care.

    Yao Li
  • Yong-Shi (Backer) Li, BSc, MSc

    • Senior Staff Associate II
    • MSc, National Taiwan University, Taiwan, 2010

    I use CRISPR to create disease models, uncover pathogenic mechanisms, and design gene therapies for inherited disorders. My focus includes age-related macular degeneration (AMD) and immunology-related diseases, as well as developing therapies for autosomal dominant BEST1 mutations.