Senior Researchers and Project Managers

Zohara Cohen
[email protected]


Zohara is a Research Manager in the Department of Otolaryngology – Head and Neck Surgery at the University of Minnesota School of Medicine. In that role she supports the submission of grant applications, manages contracts and reporting for funded research projects, and oversees the implementation of observational and clinical research studies. Prior to this role Zohara was an Informatics Research Manager for the Informatics Consulting Service, now BPIC. And before coming to the University of Minnesota, Zohara spent six years as a Program Officer at the National Institute of Biomedical Imagine and Bioengineering. She graduated with a PhD in Mechanical Engineering, with a research focus in Orthopaedic Biomechanics from Columbia University.


Yuan He
[email protected]


Yuan graduated with a Ph.D. in psychoacoustics from Indiana University and now is a postdoctoral researcher in the TESSLab. She is currently investigating neural plasticity and its role in auditory perception. Her work in the TESSLab also focuses on developing objective measurements for tinnitus treatment outcomes.



Karl-Heinz Dyballa
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Karl-Heinz is a research assistant who graduated with a doctor title at Hannover Medical School, Germany. He is currently researching on an NIH funded project in developing a novel electrical auditory prosthesis that can stimulate directly within the auditory nerve: the Auditory Nerve Implant (ANI). Thereby he is investigating the temporal and spectral properties of the generated signals when stimulating within the human auditory nerve.


Erin Feddema
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Erin Feddema is a Senior Clinical Research Coordinator in the Department of Otolaryngology – Head and Neck Surgery, where she helps design, implement and execute clinical studies. Erin holds a MPH from Johns Hopkins University Bloomberg School of Public Health and a BSME in Mechanical Engineering and BS in Biochemistry from the University of St. Thomas. Her previous experience includes working in the medical device industry as a mechanical design engineer.

Ali Stockness
[email protected]

Daniel Zachs
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Daniel Zachs graduated with a MS degree in Biomedical Engineering from University of Connecticut. He is a clinical research project manager investigating stimulation techniques of the peripheral nervous system and end-organs in various animal models and translating those technologies into human applications. Daniel's research is focused on noninvasive modulation of the interface between the immune system and the nervous system. He is currently managing research projects and clinical trials in collaboration with Medtronic, DARPA, Dr. Bryce Binstadt's lab and Dr. Erik Peterson’s lab in the University of Minnesota's Medical School and Center for Immunology.