John Hewitt runs a small company outside of Philadelphia that designs and builds custom instruments for neuroscience research. He publishes regular reviews of the literature addressing problems in biology and medicine.


  • Long Live Longevity

    Mitochondria and cellular senescence.

    ( Biology / Critical Essay / Volume 4, Issue 3 )

  • The Excitable Mitochondria

    On the fundamental units of the nervous system.

    ( Biology / Critical Essay / Volume 2, Issue 3 )