Tass Lab Team
Peter A. Tass, MD, PhD
Professor of Neurosurgery
Dr. Peter Tass investigates and develops neuromodulation techniques for understanding and treating neurologic conditions such as Parkinson’s disease, epilepsy, dysfunction following stroke and tinnitus. He creates invasive and non-invasive therapeutic procedures by means of comprehensive computational neuroscience studies and advanced data analysis techniques. The computational neuroscience studies guide experiments that use clinical electrophysiology measures, such as high density EEG recordings and MRI imaging, and various outcome measures. He has pioneered a neuromodulation approach based on thorough computational modelling that employs dynamic self-organization, plasticity and other neuromodulation principles to produce sustained effects after stimulation. To investigate stimulation effects and disease-related brain activity, he focuses on the development of stimulation methods that cause a sustained neural desynchronization by an unlearning of abnormal synaptic interactions. He also performs and contributes to pre-clinical and clinical research in related areas.
Staff Scientist
Justus Kromer, PhD
Justus Kromer's research is devoted to improving deep brain stimulation techniques causing long-lasting symptom relief in patients suffering from neurological disorders, e.g. Parkinson's disease. Being a theoretical physicist in the group of Peter Tass, Justus Kromer performs computer simulations in order to understand stimulation-induced rewiring of synaptic connectivity in symptom-related brain regions.
During his PhD studies at Humboldt University in Berlin, Germany, he gained expertise in the fields of stochastic processes, nonlinear dynamics, and computational neurosciences. He was trained in both, computational studies and theoretical modelling. His general research is devoted to understanding and manipulating noisy nonlinear systems with application to biology such as neuronal networks and signal processing systems, e.g. sensory neurons and chemotactic agents.
PostDoc
Kanishk Chauhan, PhD
Kanishk Chauhan earned his PhD in Physics from Ohio University, specializing in nonlinear dynamics, statistical and biological physics, and computational neuroscience. During his doctoral studies, Kanishk focused on developing mathematical models of plastic neuronal networks. He utilized tools from information theory and network science to investigate the coevolution of network activity and connectivity, particularly in relation to synchronization. His work also involved developing stimulation methods to counter synchrony.
At Peter Tass Lab, Kanishk is engaged in developing biologically realistic and computationally feasible models of neuronal networks associated with Parkinson's disease. His work aims to reliably model the effect of therapeutic stimulation, with the goal of advancing the development of more efficient stimulation protocols. Additionally, Kanishk is involved in EEG data analysis to understand the representation of the non-invasive vibrotactile stimulation in the brain.
Sa Zhou, PhD
Sa Zhou’s research is dedicated to developing personalized interventions for aging-related neurological disorders, including Parkinson’s disease, Alzheimer’s disease, and stroke. She focuses on closed-loop brain–computer interface (BCI)–guided neuromodulation and neurorehabilitation, and applies advanced signal processing and machine learning to multimodal neuroimaging (sMRI, DTI, fMRI) and neurophysiological signals (EEG, EMG), with the goal of identifying digital biomarkers that support cognitive and sensorimotor recovery.
During her PhD in Biomedical Engineering at The Hong Kong Polytechnic University, she focused on developing a closed-loop neurorehabilitation system that combined EEG–EMG neural decoding, robotic control, and neuromuscular electrical stimulation for stroke rehabilitation. She validated its efficacy through randomized controlled clinical trials (RCT) and multimodal neurobehavioral assessments, establishing a strong foundation for her current translational research in personalized neuromodulation and neurorehabilitation.
Clinician Scientist
Tina Munjal, MD
Tina is a resident physician in the clinician-scientist training program in the Stanford Department of Otolaryngology - Head & Neck Surgery. She received her undergraduate degree in Biochemistry & Cell Biology from Rice University and her medical degree from the Johns Hopkins University School of Medicine. She also completed a research fellowship at the National Institute on Deafness and Other Communication Disorders at the National Institutes of Health. Prior to joining the Tass lab, her research involved the cellular mechanisms of synaptic plasticity, the molecular genetics of inherited hearing loss, and the optimization of music listening for cochlear implant users. She is now investigating acoustic coordinated reset neuromodulation and other neuromodulation techniques for the treatment of subjective tinnitus.
Clinical Research Coordinator
Kathy McDonald
Kathy joined the Tass Lab in June 2025. Previously, she worked in Neurology/Neurosurgery as CRC managing Dr. Gary Steinberg’s SanBio Phase 2b Stem Cell Study and subsequently as Recruitment Coordinator for Dr. Steinberg’s NR1 Phase 1/2a stem cell study and A Study to Evaluate the Effectiveness and Safety of ExAblate Transcranial MRgFUS Thalamotomy Trial for Essential Tremors with Dr. Casey Halpern. Prior to that she was with Dr. Ronald Levy’s Lymphoma team managing Immunotherapy trials, including support on two ASCO abstracts, 2014-16. Originally from NY, Kathy previously worked at ICAHN School of Medicine in Cardiology as Clinical Trial Manager (2012-2014), NY Presbyterian/Weill Cornell Medical (2004-2012) and in the Cardiac Cath Lab & Cardiothoracic Surgery. Kathy holds a BA in Music Performance from Stony Brook University, Early Music Performance at Mannes School of Music and has taken pre-med courses at CUNY Hunter College. She splits her time between CRC at Stanford and performing on baroque and modern flute, her other passion.
Undergraduate Engineering Student
Andre Delvaux
Andre is an undergraduate student at the University of Washington studying Electrical and Computer Engineering. With the Tass Lab, he is working on computer simulations that model deep brain stimulation and how stimulation can affect fiber path activation in the brain, resulting in plastic changes of brain circuits.
DARE Fellowship MD Student
Jakob Sørensen
Jakob Sørensen, MD student, is undergoing a transformative research year in the Tass Lab as a DARE-fellow, sponsored by the Lundbeck Foundation. His primary objective within the Tass Lab centers on developing a non-invasive neuromodulation paradigm as a treatment for spasticity. Concurrently, Jakob contributes to the characterization and development of the vibrotactile Glove devised by the Lab.
Prior to joining the Tass Lab, Jakob conducted four years of fundamental neuroscience research in the Berg Lab at the University of Copenhagen, where he contributed to research in neuromodulation, populational dynamics in spinal networks and neural engineering. Through these efforts, Jakob aims to combine fundamental neuroscience, with his clinical knowledge to assist in developing novel neuromodulation therapies, ultimately improving the lives of individuals with neurological disorders. This research year will mark the completion of his MD degree.
