Harold Jeffreys
1891–1989 (age 98)
Biography
Harold Jeffreys, born in 1891, combined a love of observation with mathematical rigour as he mapped the motions of the heavens and the Earth, producing foundational work in geophysics, probability, and the study of tides.
His lectures at Cambridge and patient mentorship of younger scientists nourished a generation of researchers, and his thoughtful walks through the Church of St Helen’s grounds reflected a lifelong devotion to the natural world.