Longo Lab Members

Longo Lab

Frank M. Longo, MD, PhD
George E. and Lucy Becker Professor in Medicine
Professor of Neurology & Neurological Sciences

Dr. Longo is the George E. and Lucy Becker Professor of Neurology and Neurological Sciences at Stanford University. He received his MD and PhD from the University of California, San Diego. Following an internship in medicine at New York University, he trained as a resident in neurology at UC San Francisco where he also completed a fellowship in neurobiology. He joined the UCSF faculty and eventually served as professor and vice chair of UCSF’s Department of Neurology. Before joining Stanford in 2006, Dr. Longo was the H. Houston Merritt Professor and Chair of Neurology at the University of North Carolina – Chapel Hill. At Stanford, he served as the Chair of the Department of Neurology and Neurological Sciences from 2006 to 2023. He is also a faculty member of the Wu Tsai Neurosciences Institute at Stanford.

His research interests include elucidation of mechanisms underlying neurodegenerative diseases and translational research targeting such mechanisms. Dr. Longo is the 2015 recipient of the inaugural Melvin R. Goodes Prize for Excellence in Alzheimer’s Drug Discovery from the Alzheimer’s Drug Discovery Foundation, and he currently serves on the National Advisory Council on Aging for the NIH. He is founder and board chair for PharmatrophiX, a clinical-stage company focused on small molecule therapeutics for neurodegenerative diseases.
 

Instructors

Amira Latif-Hernandez, PhD
Instructor, Neurology and Neurological Sciences

Amira obtained her Ph.D. in Neuroscience from the KU Leuven, Belgium, in the summer of 2017. One of the most gratifying contributions of her doctoral studies was the development of a new electrophysiology tool to assess synaptopathies and the establishment of long-term synaptic plasticity from prefrontal cortex slices to characterize the pathophysiology of novel mouse models of Alzheimer’s disease. In Autumn of 2017, she moved to the Longo laboratory at the Stanford School of Medicine. During 3 years of post-doctoral work, she independently established a multi-electrode array system that allows high-throughput analyses of multiple long-lasting forms of synaptic plasticity. Her projects involve neuronal plasticity, RNA-sequencing, molecular biochemistry, signaling mechanisms, target validation and drug development strategies for Alzheimer’s disease with the objective of investigating neurotrophin receptor signaling pathways that contribute to synaptic degeneration and preservation. In October 2020, Amira was appointed Instructor of Neurodegenerative Disease Research at Stanford Neurology, to help develop improved and more powerful approaches that will better reveal key synaptic mechanisms and candidate modules associated with neuroplasticity and affected in AD mouse models, by identifying activity-dependent gene expression signatures that will ultimately serve as a platform for potential therapeutics and animal to human translation. When Amira is not dedicated to science, she truly enjoys running, hiking, dancing, cycling, boxing, cooking, reading books, writing journals, and, when possible, camping, surfing and climbing.

Research Scientists

Tao Yang, PhD
Senior Research Scientist

Tao Yang received her PhD from Beijing Medical University, now Peking University Health Science Center. She has spent a significant portion of her career in Dr. Frank Longo's lab, making pivotal contributions to pioneering research to find cures for neurological diseases. She screened and characterized small molecule ligands for neurotrophin receptors which including partial agonists for TrkB and TrkC, as well as the modulators for p75NTR. She discovered these small molecules that promoted neuronal survival, neurite outgrowth, and differentiation of human stem cells into neurons in vitro. She further discovered significant therapeutic properties of those small molecules that prevented neuronal degeneration, dendrites dystrophy and spine loss across various diseases models in both in vitro cell models and in vivo animal models. The overall theme of her current research concentrates on understanding the roles and mechanisms of small molecules in neuronal networks, synaptic functions, neural stem cells and neurodegenerative diseases including Alzheimer’s disease (AD), Parkinson’s disease (PD) and Charcot-Marie-Tooth (CMT) disease. Her ultimate goal is to develop improved small molecules to treat or prevent these diseases. 

Danielle Simmons, PhD
Senior Research Scientist

Danielle Simmons received her Bachelor’s degrees in Biological Sciences and Psychology from Rutgers University in New Brunswick, New Jersey and her PhD in Neuroscience at the University of California, Irvine, where she also conducted her post-doctoral studies. Her post-graduate work focused on the role of neurotrophin receptor signaling and neuroinflammation in Huntington’s Disease (HD). She joined Dr. Frank Longo’s laboratory as a Senior Scientist in the Stanford School of Medicine in 2008, where her research has focused on identifying mechanisms underlying HD and Alzheimer’s disease (AD) and developing small molecule therapeutic strategies to target these mechanisms. Danielle has been assessing the therapeutic effects of small molecule neurotrophin receptor ligands, including LM11A-31, LM22A-4, and LM22B-10, that were developed in the Longo laboratory against neurodegeneration in multiple mouse models of HD. Through this work she has identified HD-related deficits in signaling via the neurotrophin receptors, p75, TrkB and TrkC and found that normalizing this signaling with LM11A-31, LM22A-4, or LM22B-10 and its derivatives ameliorates HD phenotypes. Regarding AD, Danielle is investigating the therapeutic effects of small molecule modulation of signaling via p75NTR or simultaneous modulation of TrkB and TrkC on vulnerable cell populations, including basal forebrain cholinergic neurons and parvalbuminergic interneurons in amyloid mouse models of AD. Her current projects also involve identifying neuroimaging, urinary, and blood biomarkers to assess the treatment response of the lab’s neurotrophin receptor ligands and other putative therapeutics for HD and AD. Danielle’s ultimate goal is to develop effective strategies for preventing HD and AD-associated neurodegeneration and monitoring the efficacy of potential therapeutics for these diseases by identifying mouse-to-human translatable biomarkers. In her leisure time, Danielle enjoys reading about and viewing art, reading fiction (especially mystery/thriller novels), hiking, pickleball, wine tasting, watching football, and travel. 

Robert Butler III, PhD
Senior Research Scientist

Robert Butler received his Bachelor’s Degree from Occidental College and his Master’s and PhD degrees from Illinois Institute of Technology, specializing in comparative genomics and bioinformatics. His pre-doctoral and doctoral work examined developmental genetics and evolutionary adaptation of microorganisms in a range of pathogenic and commensal roles, exploring horizontal and vertical inheritance of novel traits. His postgraduate research in psychiatric genomics integrated large-scale patient cohorts, animal models, and iPSC in vitro analysis to understand heritability in multiple psychiatric phenotypes including smoking behaviors, Alzheimer’s and neuropsychiatric disorders. Since joining the Longo Lab in 2020, Robert has compared mouse and human multi-omic datasets to better define their shared heritability in neurodegenerative disorders and identify early biomarkers of and cell types implicated in disease progression. Focusing on neurotrophin-associated signaling, he is examining altered single-cell & spatial transcriptomics, proteomics and cellular communication in models of tau and amyloid pathology to inform new gene targets and novel drug compounds with increased likelihood of translation to human therapies.

Lab Manager

Sukhneet Kaur, BS
Life Science Research Professional - Lab Manager

Sukhneet graduated from Mount Holyoke College in May 2021, where she pursued a major in Neuroscience and a Psychology minor, with a concentration in Data Science. Here, she worked on analyzing event related potential (ERP) data, to filter the noise and artifacts using MATLAB, for multiple projects in the Couperus lab. Sukhneet also worked as an undergraduate student researcher in the Visual Cognition and Attention (VCA) lab at the University of Massachusetts, Amherst. While at the VCA Lab, she worked with human eye tracking data to study different search strategies used while performing visual search tasks. Her undergraduate thesis emphasized that when a visual search task is easy people tend to use less efficient visual search strategies and that a visual search task must meet a ‘hardship threshold’ to encourage more efficient search strategies. Sukneet joined the Longo lab at Stanford University in August 2021 where her research focus is studying the therapeutic effects of small molecule ligands that bind to neurotrophic receptors in mouse models of neurodegenerative diseases, primarily Alzheimer’s. Her future goal is to pursue a PhD that focuses on the intersection of Psychology and Neuroscience, with an emphasis on studying consciousness. In her free time, Sukhneet likes to take leisure walks full of introspection and good music, paint abstract art (using acrylics and digital art tools), read Leo Tolstoy or Aldous Huxley, study philosophy and perception, and write Urdu poetry.

Science Writer

Vanessa Langness, PhD
Science Writer

Vanessa holds a PhD in biomedical sciences from the University of California San Diego and a bachelor's degree in chemistry and biology from Metropolitan State University of Denver. Her thesis work focused on genetically engineering human induced pluripotent stem cell derived neurons and using them to evaluate the effects of small molecules on Alzheimer's disease pathways. After graduate school, Vanessa worked as a scientist in the biotech industry where she used a variety of genetic and molecular biology approaches to support cell therapy and drug development projects. Vanessa enjoys the challenge of communicating complex scientific ideas both visually and in writing. She has published her research in peer reviewed journals and has authored abstracts and slide decks that have been selected for presentation at international scientific conferences. Vanessa served on the outreach committee with the Association for Women in Science (AWIS) where she developed hands-on scientific demonstrations for lay-audiences, crafted educational material, authored newsletter articles, and photographed outreach events. In her free time Vanessa enjoys making and viewing art, taking dance classes, reading, and spending time with her family and pets. Vanessa aspires to merge her love of science, art, and writing to help researchers communicate their findings to both scientific and general audiences.

Life Science Research Professionals

Nidhi Shettigar
Life Science Research Professional

Nidhi Shettigar received her B.S. in Neuroscience from Saint Louis University in 2024. As a researcher at Washington University at the St. Louis School of Medicine, she studied the anatomical organization and behaviors associated with the superior colliculus, a rapid sensorimotor region of the brain. Nidhi joined the Longo lab in July of 2024 and is investigating whether small molecule neurotrophin receptor ligands can provide neuroprotection in mouse models of Huntington's (HD) and Alzheimer’s disease (AD). Her current project is examining the role of microglia in pathological removal of synapses in HD and AD. Her future plans are to complete a medical degree to become a physician. She aspires to continue research throughout her career. Outside of research, she enjoys walking with her dog, reading and trying new restaurants.