School of Medicine


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  • Stephen Lawrence McKenna, MD

    Stephen Lawrence McKenna, MD

    Clinical Professor (Affiliated), Neurosurgery
    Staff, Neurosurgery Operations

    BioDr. Stephen McKenna is a founding member of the Stanford Partnership for Spinal Cord Injury and Repair. He is currently the Chief of the Rehabilitation Trauma Center; as well as, the site director of the Advanced SCI Medicine Fellowship at SCVMC.

    As a Neurocritical Care physician, Dr. McKenna specializes in ventilator-dependent Spinal Cord and Traumatic Brain Injury, as well as neuromuscular diseases. He has led first-in-human clinical trials ranging from vaccines for HIV to stem cell-derived oligodendrocyte progenitor cell-based therapies for SCI. Dr. McKenna is Chairman of the Respiratory Section of the International Standards to Document Autonomic Function after SCI (ISAFSCI) and co-chair of the American Spinal Cord Injury Association (ASIA) Research Education Subcommittee.

    Clinical Focus:
    Spinal Cord Injury
    Traumatic Brain Injury
    Amyotrophic lateral sclerosis (ALS)
    Guillain-Barre syndrome (GBS)
    Anti-NMDA receptor encephalitis
    Neuromyelitis Optica (Devic disease)

    Professional Education:
    Board Certification: Neurocritical Care, UCNS (2008)
    Board Certification: Internal Medicine, ABIM (2005)
    Internship & Residency: Santa Clara Valley Medical Center (2002,2005)
    Medical Education: Stanford University School of Medicine (2002)

    Book Chapter:
    Shah A, Shem K, McKenna SL, Berlly M. Management of Respiratory Failure in Spinal Cord Injury. Spinal Cord Medicine (Hardcover) by Steven, M.D. Kirshblum (Editor) Lippincott Williams & Wilkins; 2011

    Selected Publications:
    Exploration of surgical blood pressure management & expected motor recovery in individuals with traumatic SCI.
    Ehsanian R, et al, McKenna SL.
    Spinal Cord. 2020 Mar;58(3):377-386. PMID: 31649323

    A Novel Pharyngeal Clearance Maneuver for Initial Tracheostomy Tube Cuff Deflation in High Cervical Tetraplegia.
    Ehsanian R, et al, McKenna S.
    Am J Phys Med Rehabil. 2019 Sep;98(9):835-838. PMID: 30973517

    Burden of Care Implications & Association of Intracranial Hypertension with Extremely Severe Post-traumatic Amnesia After TBI: A 5-Year Retrospective Longitudinal Study.
    Quach NT, et al
    Front Neurol. 2019 Jan 29;10:34. PMID: 30761071

    Venous Thromboembolism is Associated with Lack of Vitamin D Supplementation in Patients with SCI & Low Vitamin D Levels.
    Ehsanian R, et al
    PM R. 2019 Feb;11(2):125-134. PMID: 30300766

    Pulmonary outcomes following specialized respiratory management for acute cervical SCI: a retrospective analysis.
    Zakrasek EC, et al, McKenna SL
    Spinal Cord, 2017; Feb 21. PMID: 28220822

    Dose Response Effect of Exposure to Hypotension on Expected Neurological Recovery in Individuals with Traumatic SCI.
    ARCHIVES OF PM&R
    Reza, E., et al, McKenna, S.
    2016: DOI: http://dx.doi.org/10.1016/j.apmr.2016.09.016

    Combined SCI & TBI: recovery of forelimb function after unilateral cervical SCI is retarded by contralateral traumatic brain injury (TBI), & ipsilateral TBI balances the effects of SCI on paw placement.
    EXPERIMENTAL NEUROLOGY
    Inoue T, et al.
    2013 Oct 248: 136-47. PMID: 23770071

    Functional electrical stimulation in SCI respiratory care.
    TOPICS IN SPINAL CORD REHAB.
    R Jarosz, et al, S McKenna
    2012:Vol. 18, No. 4, 315-321. PMID: 23459661

    Impact of mean arterial blood pressure during the first seven days post SCI.
    TOPICS IN SPINAL CORD REHAB.
    J Cohn, et al
    2010: DOI: http://dx.doi.org/10.1310/sci1503-96

    Successful Pregnancy & Delivery in a C1 ASIA A spinal cord injured Woman: The Role of Coordinated Care Between PM&R & Obstetrics Services: A Case Report.
    PM&R
    Lin C, et al
    2010: DOI: http://dx.doi.org/10.1016/j.pmrj.2010.07.461

    The impact of project closure on HIV incidence and mortality in a cohort of couples in Lusaka, Zambia.
    AIDS CARE
    Stephenson R, et al
    2008 Jul;20(6):683-91. PMID: 18576170

    Rapid HIV testing & counseling for voluntary testing centers in Africa.
    AIDS
    McKenna SL et al
    1997 Sep;11 Suppl 1:S103-10. PMID: 9376093

  • Rebecca Mckenzie

    Rebecca Mckenzie

    Clinical Assistant Professor, Pediatrics - General Pediatrics

    Current Research and Scholarly InterestsPediatric liver transplant, outcomes, adherence, transition, liver failure

  • Safyer McKenzie-Sampson

    Safyer McKenzie-Sampson

    Member, Maternal & Child Health Research Institute (MCHRI)

    BioSafyer McKenzie-Sampson is an IDEAL Provostial Fellow and instructor within the Department of Pediatrics at Stanford University. Dr. McKenzie-Sampson is a social and perinatal epidemiologist, focused on researching the multi-level impacts of exposure to racism across the life course on the risk of adverse perinatal outcomes in Black communities, with the goal of translating findings into interventions to increase birth justice. Her research portfolio uniquely interrogates the rates of adverse perinatal outcomes through the lens of maternal nativity in the United States which allows for focus on the experiences of Black immigrants. She is currently the principal investigator of the AZANIA study, a mixed methods pilot study which collects data on the pregnancy and childbirth experiences of African immigrants in California. Dr. McKenzie-Sampson received her PhD in Epidemiology and Translational Science from the University of California San Francisco, and in addition to her research, she supports families in the Bay Area as a full-spectrum community doula.

  • Tracey McLaughlin

    Tracey McLaughlin

    Professor of Medicine (Endocrinology)

    Current Research and Scholarly InterestsDr. McLaughlin conducts clinical research related to obesity, insulin resistance, diabetes, and cardiovascular disease (CVD). Current studies include: 1) the impact of macronutrient composition on metabolism, DM2 and CVD; 2) comparison of different weight loss diets on metabolism and CVD risk reduction ; 3) role of adipocytes and adipose tissue immune cells in modulating insulin resistance; 4) use of continuous glucose monitoring and multi-omics to define metabolic phenotype and precision diets

  • Carmen McLean

    Carmen McLean

    Clinical Professor (Affiliated), Psych/General Psychiatry and Psychology (Adult)

    BioCarmen McLean, PhD, is a clinical psychologist and researcher with the Dissemination and Training Division of the National Center for PTSD at the Palo Alto VA Health Care System. Dr. McLean’s research focuses on increasing the implementation and reach of evidence-based treatments for posttraumatic stress disorder (PTSD).

  • Uel Jackson McMahan

    Uel Jackson McMahan

    Professor of Neurobiology and of Structural Biology, Emeritus

    Current Research and Scholarly InterestsWe are currently investigating mechanisms involved in synaptic transmission and synaptogenesis using electron microscope tomography in ways that provide in situ 3D structural information at macromolecular resolution.