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MSDx, Inc.

MSDx is a precision medicine company developing blood testing products for brain diseases. Today there are no clinical blood based products available!

  • Stage Prototype Ready
  • Industry Medical Devices and Equipment
  • Location Tucson, AZ, USA
  • Currency USD
  • Founded February 2010
  • Employees 5
  • Incorporation Type C-corp
  • Website msdx.co

Company Summary

MSDx is a precision medicine company developing blood testing products for monitoring neurodegeneration in brain diseases. These products provide the neurologists with critical data that can be useful in diagnosis, monitoring, and assessing therapeutics response. At launch, the company will offer the MSDx blood test panel as a as a service through a CLIA Certified Laboratory.


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    Marie R. Wesselhoft
    President & Co-Founder

    Marie Wesselhoft has over 30 years in diagnostics in General Management, sales, and marketing for Cardinal/ Baxter and was a hospital laboratory director for Humana. In her role as GM of the Scientific Products, an $850 million business, the responsibilities included management of a 120+ member sales team and a 20+ member marketing organization. Throughout her career she had the opportunity to launch several $25-50M diagnostic product lines.

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    Ramesh Chad Nayak, PhD
    Director of Research

    Ramesh Nayak, PhD., has a 30-year career in immunology and neurology. He was a doctoral student in the Department of Neurochemistry, Institute of Neurology, Queens Square London. He was a Research Fellow, Harvard Medical School; Assistant Professor, Harvard Medical School and Tufts University College of Medicine; Staff Investigator, Joslin Diabetes Center in Boston; and Research Associate Professor, Department of Ophthalmology, Univ. of Arizona

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    Michael Sember
    Vice Chairman

    Principal at Brush Creek LLC, a biopharmaceutical consulting firm. Mike Sember has over 30 years of experience in the life Science and pharmaceutical industries. Currently he is an entrepreneur and business development consultant. Most of Mike’s career was with Marion Merrell Dow and Élan Corporation. He served as Executive VP of Business Development at Élan for over 10 years. There he led investment activities and licensing deals.

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    Melita Ball, CQA
    Director of Regulatory and Quality

    Melita Ball, CQA, held Corporate Director-level leadership positions in Quality and Regulatory Compliance for Medical Device and Diagnostic companies for 17 years before she opened her consulting firm in 2006. Melita brings expertise in Project Management, Regulatory Compliance, Quality System Development, 21 CFR Part 11, Software Validation, Supplier Qualification & Management, Quality Auditing, Regulatory & Quality Training.

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    Betty Weaver, CPA

    Betty Weaver has over 15 years in public accounting with a regional firm in the Dallas/Fort Worth area including several years as principal of her own accounting firms in both Arizona and Texas. She provided tax, review, and consulting to both public and private companies. Her career also includes over 11 years in industry. Industry experience includes both public and private companies as Controller or Chief Financial Officer.

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    Conrad A. Plimpton
    Chairman of the Board

    Conrad Plimpton currently serves as Chairman of the Inolex Chemical Company; partner of Corporate Development International (CDI Global) in pharma biotech; the founding Chairman of Comartis USA; founding shareholder and director of Troy Chemical; founded NeuroHealth Foundation in ZUG to sponsor Multiple Sclerosis Research at the University of Zurich; the Chairman of Cibola Technologies, Tucson Arizona; and previously was Chairman, founding shareh

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    Timothy L Vollmer, MD
    Clinical Advisor

    Timothy L. Vollmer, MD, is Professor and Director of Clinical Research, Department of Neurology, University of Colorado Denver School of Medicine. Dr. Vollmer is also Medical Director of the Rocky Mountain MS Center with a special interest in immunotherapies for MS. Dr. Vollmer is currently involved as Principle Investigator in 18 clinical Multiple Sclerosis studies at the University of Colorado. To date, he has completed over 70 clinical studies

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    David McCaleb
    Board Member

    David McCaleb, MSDx Board Member, is currently the Chief Executive Officer of Susavion Biosciences. With over thirty years of experience in leading pharmaceutical companies and biotech start-ups, his successful track record in commercialization and fundraising will augment the MSDx team. During Mr. McCaleb’s career he played a central role in the establishment of commercialization infrastructure at several highly successful companies including A

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    David A Stumpf, MD, PhD
    Medical Affairs Advisor

    David A. Stumpf, MD, PhD, is Professor Emeritus at Northwestern University and President of Woodstock Health Information and Technology. Dr. Stumpf had a successful clinical and research career in neurology, including the position of Professor and Chairman of the Department of Neurology at Northwestern University Feinberg School of Medicine in Chicago. In 2005, Dr. Stumpf accepted the position of Medical Director of UnitedHealthcare, Illinois.

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    Grant Senner, MD.
    Advisor for Reimbursement & Coverage

    Grant Senner, MD., Advisor for Reimbursement, is Founder of Sentinel Consulting Group with more than ten years of experience in medical finance, medical practice management, business development and applied biomedical research. Dr. Senner served as Fellow and Consultant for the State of Arizona’s Medicaid agency where he focused on quality and utilization management, network development, physician contracting and Centers for Medicare and Medicaid


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    Larry Hecker, Corporate Law; Hecker & Meuhlbach
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    Betty Weaver, CPA

Previous Investors

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    Desert Angels: Plimpton, Sim, Sember, Mills, Hungate, Moeller, Knapp,
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    Individuals: Cho, Damico, Labrum, Kesman, Wesselhoft, McCaleb, Zorc
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    Individuals: Conger, Nirh, Bassett, Runyen, Fasetti