| Simon Cassidy studied mathematics in his native England and later worked as a software engineer on medical devices in California. He had an IQ of 180. His scholarly interests included calendar studies and the prehistory and history of mathematics and astronomy. He was an authority on the astronomy of Stonehenge, and studied the role of John Dee in the history of mathematics, calendars, and geography (see below). One of his projects was to gain recognition for a correct understanding of the vernal equinox year, its role in the history of the calendar and its correct measurement. Simon Cassidy's last email communication to this writer was in mid-2018. After that it seems his health worsened progressively. He died at a nursing home in Petaluma, CA, in early-January 2023.
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